Skip to content
Knowledge base

Everything you need to know about Openline

Search a question, a device, or a country — and get a straight answer in seconds. Powered by 2700+ articles the Openline team keeps up to date. Every plan is delivered as a purchase code you can redeem yourself, keep for later, or gift — anytime, anywhere.

0 articles 0 guides 0 fixes 0 categories

Pick one or more categories to narrow the list below. Filters combine with the search box and update the list live as you toggle them.

Categories

 

Technical

guides & how‑to troubleshooting 67 articles
  • Is Openline GDPR compliant?
    Yes. We're registered as a data controller and processor in the EU. Full DPA available on request.
    Technical
  • Does Openline support IPv6?
    Yes, where the partner network supports it. Most modern partner networks do. - openline.com/privacy for the full privacy policy.
    Technical
  • Does Openline give me a public IP?
    You typically get a carrier-grade NAT IPv4 address, plus a public IPv6 address where supported.
    Technical
  • Can I run a server on my Openline connection?
    Inbound server traffic is not practical on carrier-grade NAT. Openline is designed for client-side data (browsing, apps, calls).
    Technical
  • Does Openline support Wi-Fi Calling?
    Wi-Fi Calling is a feature of your primary carrier (home line). It doesn't apply to Openline's data-only eSIM.
    Technical
  • Does Openline support VoLTE?
    Openline is data-only. VoLTE (Voice over LTE) requires a voice-capable core we don't operate.
    Technical
  • Can I use Openline for BitTorrent?
    Technically yes on Unlimited plans; large sustained P2P uploads can trigger local partner traffic-shaping in some countries.
    Technical
  • Can I use Openline for online gaming?
    Yes. Latency in urban centres is typically low enough for real-time gaming. Some cloud gaming services may hit congestion in rush hour —…
    Technical
  • Does Openline block any ports or protocols?
    No. Openline does not filter or block traffic. If you can't reach a specific service, it's not us — check the destination's own status and…
    Technical
  • Can I use my own DNS on Openline?
    Yes. Openline uses the partner network's DNS by default; override in your device settings if you prefer 1.1.1.1, 9.9.9.9, or a private…
    Technical
  • Does Openline support DoH / DoT?
    DNS-over-HTTPS and DNS-over-TLS are configured at the device level — Openline transports the traffic without interference.
    Technical
  • Does Openline support MMS?
    Openline plans are data-only, no MMS. Send photos over WhatsApp, iMessage, or Signal instead.
    Technical
  • Does Openline support RCS?
    RCS is tied to your home mobile number's carrier — not Openline. Your home line continues to handle RCS.
    Technical
  • Can I make emergency calls on Openline?
    Every phone can make emergency calls even without an active plan, as long as any cellular signal is available.
    Technical
  • Does Openline support Wi-Fi hotspot bridging (5G modem)?
    Yes for consumer hotspots that accept eSIM (Solis, TP-Link M7350 5G, GlocalMe, Netgear Nighthawk M6).
    Technical
  • Does Openline work on rooted or jailbroken devices?
    Yes, the eSIM standard doesn't care. Rooted/jailbroken devices sometimes have modified network stacks; if data doesn't come up, revert or…
    Technical
  • What is SM-DP+ and how does it relate to my Openline eSIM?
    SM-DP+ stands for plan Manager – Data Preparation Plus. It's the server that holds your eSIM profile between the moment we generate it and…
    Technical
  • What's the difference between SM-DP+ and SM-DS?
    Both are GSMA-standard servers in the eSIM ecosystem. They do different jobs. - SM-DP+ (Data Preparation Plus) hosts and delivers a…
    Technical
  • What is an eUICC and how much can it hold?
    The eUICC is the physical chip embedded in your phone that stores eSIM profiles — the modern equivalent of a plastic SIM card.
    Technical
  • What is an activation code (AC_Token) and why is it single-use?
    An activation code — sometimes called ACToken in GSMA specifications — is a short string embedded in your QR code that unlocks your profile…
    Technical
  • What is LPA and why does it matter for eSIM install?
    LPA stands for Local Profile Assistant. It's the software on your phone that manages eSIM profiles — downloading, enabling, disabling, and…
    Technical
  • Is Openline's traffic encrypted end-to-end?
    The path between your phone and Openline's infrastructure is encrypted like any modern cellular data connection: - Between your phone and…
    Technical
  • What is IMSI and can I see it on my Openline eSIM?
    The IMSI (International Mobile Subscriber Identity) is a 15-digit number that identifies your plan within a mobile network — like a…
    Technical
  • What is an MCC/MNC and why does Openline switch between them?
    MCC (Mobile Country Code) and MNC (Mobile Network Code) together identify a specific carrier in a specific country.
    Technical
  • How does Openline's multi-Tier-1 network switching work?
    Openline's differentiator is multi-Tier-1 switching: in each country we connect you to whichever of 3–5 premium partners has the strongest…
    Technical
  • What is a Tier-1 carrier and why does it matter?
    "Tier-1" is industry shorthand for a national mobile operator that owns and operates its own radio network — as opposed to an MVNO that…
    Technical
  • Does Openline support 5G Standalone (SA) or Non-Standalone (NSA)?
    Both, where the partner network supports them. - 5G Non-Standalone (NSA) overlays 5G radio on an LTE core.
    Technical
  • What is VoLTE and does Openline support it?
    VoLTE (Voice over LTE) is voice calls carried over the 4G/LTE data path instead of a dedicated 2G/3G voice channel.
    Technical
  • What is Wi-Fi calling and does it work with Openline?
    Wi-Fi calling lets your phone route calls and SMS through Wi-Fi instead of a cellular tower.
    Technical
  • What is APN and do I need to set it manually for Openline?
    APN (Access Point Name) is the DNS-like handle your device uses to route data through a specific mobile network.
    Technical
  • What is an EID and where do I find it?
    The EID (eUICC Identifier) is a 32-digit unique identifier for your device's eSIM chip.
    Technical
  • Can I have two Openline plans on the same iPhone at once?
    Yes. iPhone caches up to 8 eSIM profiles simultaneously; two can be active data lines at any given time.
    Technical
  • Can Openline show up as my default carrier name in the status bar?
    No, and this is by design. Your phone shows the partner network's name in the status bar (Vodafone, KDDI, Movistar, etc.) because that's…
    Technical
  • What GSMA specifications does Openline follow?
    Openline is built on the current GSMA eSIM specifications: - SGP.22 v3 — consumer remote SIM provisioning (RSP).
    Technical
  • What ports does Openline block?
    None. Openline is a normal cellular data path; local partner networks may have their own filters (some block SMTP outbound, for instance)…
    Technical
  • Can I run a Tor exit node over Openline?
    Technically the protocol works, but running a Tor exit node on a mobile eSIM is impractical: NAT prevents inbound connections, and any…
    Technical
  • Can I run a VPN server on my Openline connection?
    Same answer as Tor exit node: NAT and mobile IP rotation make it impractical. For inbound reachability, use a hosted VPS as your VPN…
    Technical
  • Does Openline support IPv6-only carrier networks?
    Yes. Some Openline partners deploy IPv6-only cores with NAT64 for legacy IPv4 traffic.
    Technical
  • How do I find my Openline eSIM's ICCID?
    The ICCID is the eSIM's serial number. Contact support may ask for it. iPhone: Settings → Cellular → tap Openline line → scroll down to…
    Technical
  • How do I find my phone's IMEI and EID for Openline support?
    IMEI: Dial #06# on any phone. Shows both IMEI (for the phone) and EID (for eSIM-capable devices).
    Technical
  • How do I check my Openline data usage in real time?
    Sign in at openline.com → My Plans → click your active plan for current usage and remaining data.
    Technical
  • How do I test which partner network my Openline is connected to right now?
    iPhone: Settings → Cellular → Openline → Network Selection → the currently connected carrier is shown at the top (or as the highlighted one…
    Technical
  • What does the carrier name in my status bar mean?
    Your phone shows the local partner-network name, not "Openline". This is standard eSIM behavior — the eSIM registers on a real carrier and…
    Technical
  • What is SM-DP+ and why does Openline need it?
    SM-DP+ (plan Manager Data Preparation) is the GSMA-standard server that securely delivers eSIM profiles to your phone.
    Technical
  • What is the eUICC and how does Openline use it?
    The eUICC is the eSIM chip inside your phone. Openline's profile lives on it as one of the profiles the eUICC can hold.
    Technical
  • What is an ICCID and why do we ask for yours?
    ICCID is the unique 19-20-digit ID of your eSIM. Support uses it to look up your specific line, diagnose issues, and reissue if needed.
    Technical
  • What is an EID and how is it different from ICCID?
    EID is your phone's eSIM chip serial (32 digits). ICCID is the profile serial. Multiple ICCIDs live on one EID.
    Technical
  • What is IMSI and does Openline expose it?
    IMSI is the international mobile subscriber ID inside your profile. It's used for carrier authentication.
    Technical
  • What is IMEI and why does the network care?
    IMEI is your phone's hardware ID. Carriers check it against a global blacklist for stolen phones.
    Technical
  • How does eSIM roaming actually work at the technical level?
    Your eSIM profile contains authentication credentials for the "home" network (Openline's partner).
    Technical
  • What is a Home Location Register (HLR)?
    The HLR is a database that stores subscriber information: authentication, allowed services, current location.
    Technical
  • What is a VPLMN and how does it affect Openline?
    Visited Public Land Mobile Network — the partner network you're attached to abroad.
    Technical
  • What is diameter signaling and why should you care?
    Diameter is the protocol used for authenticating roaming subscribers. If Openline's diameter link to a partner has an outage, activation…
    Technical
  • Why doesn't Openline offer voice calls?
    Voice roaming requires a Mobile Switching Center (MSC) infrastructure Openline doesn't operate. We focus on data-only travel eSIMs.
    Technical
  • Why doesn't Openline offer SMS?
    SMS requires an SMS Center (SMSC) infrastructure we don't operate. Use over-the-top messaging (WhatsApp, iMessage, Signal, Telegram)…
    Technical
  • What frequency bands does Openline use?
    Openline uses whichever bands the partner network in each country operates. Your phone auto-selects.
    Technical
  • Does Openline support 5G Standalone (5G SA)?
    Yes, where partner networks deploy 5G SA. This is currently rare — most 5G is Non-Standalone (5G NSA).
    Technical
  • Does Openline support 5G Non-Standalone (5G NSA)?
    Yes. Most 5G partner deployments are NSA. Your phone falls back to 4G/LTE core with 5G radio when NSA is active.
    Technical
  • What is CGNAT and does Openline use it?
    Carrier-Grade NAT is used by mobile carriers to share IPv4 addresses across many users. Openline uses CGNAT on IPv4.
    Technical
  • Can I get a static IP with Openline?
    Standard consumer plans use CGNAT/dynamic IPs. Business plans can request a dedicated IP for a monthly fee. Contact business team.
    Technical
  • What DNS server does Openline use?
    The partner carrier's DNS by default. You can override with a Private DNS profile: Cloudflare 1.1.1.1, NextDNS, etc.
    Technical
  • Does Openline block any ports?
    Openline doesn't block outgoing ports by default. Some partner networks may block SMTP (25), NetBIOS, or SIP as anti-abuse measures.
    Technical
  • Does Openline support VPN traffic?
    Yes. WireGuard, OpenVPN, IKEv2, Tailscale, all work. If your VPN drops or reconnects frequently, try a different UDP port (WireGuard…
    Technical
  • Can Openline traffic be traced back to me?
    Openline knows the ICCID and the aggregate traffic (bytes). Content of traffic is TLS-encrypted end-to-end.
    Technical
  • Is Openline HIPAA compliant?
    Openline's consumer product isn't HIPAA-attested. For healthcare use cases, contact business team about Enterprise SLAs and BAAs.
    Technical
  • Does Openline support MFA/2FA on my account?
    Yes. Enable TOTP or WebAuthn/passkey at openline.com → Account → Security. Required for Business tier admins.
    Technical
  • Can I use a hardware key (YubiKey) with Openline?
    Yes, via WebAuthn. Register your key at Account → Security → Add security key. - openline.com/privacy for the full privacy policy.
    Technical

No match yet.

Try a shorter phrase (e.g. refund) or a country name. If you can’t find what you need, chat with us on openline.com.

Article

Still stuck?

Reach Openline support 24/7 through the channel that suits you. Include your purchase code (the OL-… code we emailed you) and, if the eSIM is already installed, its ICCID — that's enough for us to find your plan and diagnose without back-and-forth.

Open live chat Email support WhatsApp Messenger
Or DM @askopenline on

Related articles

    Browse by category

    • Getting started80
    • Installation16
    • Devices & compatibility239
    • Plans & coverage443
    • Coverage by country1116
    • Payment & billing79
    • Data usage87
    • Troubleshooting348
    • Account10
    • App & website4
    • Security & privacy31
    • Legal & policy25
    • Business & IoT61
    • Referrals19
    • Special use cases92
    • Technical67
    • Support7
    • Company & brand13
    © Openline · Privacy · Terms 0 articles indexed