eUICC SIMs carry multiple UK operator profiles and switch between them automatically when coverage degrades. Combined with WireGuard, the Speedroute static IP survives every carrier switchover — no reconfiguration, no whitelist updates, no intervention.
eUICC vs standard SIM
| Property | Standard SIM | eUICC multi-network SIM |
|---|---|---|
| Operator profiles | One — single carrier | Multiple — EE, Vodafone, O2, Three |
| Switches carrier on coverage loss? | No — stays offline | Yes — automatically |
| Carrier lock-in risk | High | None |
| Impact of Vodafone/Three merger | High if on Three SIM | None — switches to EE or O2 |
How WireGuard preserves the static IP during a carrier switch
- eUICC SIM switches from EE to O2 — router gets new cellular IP
- WireGuard detects local IP change via keepalive mechanism
- WireGuard sends updated handshake to Speedroute hub from new cellular IP
- Hub updates routing for that peer
- Tunnel re-establishes — typically 5–10 seconds
- All traffic continues via same static IPv4 — unchanged
UK carrier coverage
| Network | Coverage | Notes |
|---|---|---|
| EE | Broadest overall | Best for rural and construction |
| Vodafone | Strong — business and industrial | Post-merger inherits Three infrastructure |
| O2 | Strong urban | Good indoor penetration |
| Three | Good urban, variable rural | Merging with Vodafone |
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