Start Here

Start here if you are trying to understand eUICC, eSIM, SGP.32, IoT routers, mobile networks and the practical choices behind connected-device deployments.

Quick answer: eUICC.co.uk is designed as a practical reference library. It explains the standards, but it also connects them to routers, SIM providers, platforms, APNs, roaming, VPN access and real-world rollout problems.

What this site is for

Most eSIM explanations stop too early. They describe a programmable SIM, then drift into marketing language about flexibility. That is not enough for IoT. A device estate still needs the right hardware, the right profile strategy, the right mobile network arrangement, the right IP addressing model, and a way back in when something goes wrong.

This site exists to join those pieces together. It treats eUICC as part of a deployment system, not a magic chip.

Recommended route through the site

1. Understand eUICC 2. Compare SGP.22 and SGP.32 3. Review hardware realities

Who it is written for

IoT product managers planning connected devices
Engineers testing routers, gateways, modules and SIM behaviour
Procurement teams trying to avoid supplier lock-in
Connectivity resellers and integrators who need plain technical material
Anyone trying to separate eSIM reality from brochure fog

How to use the wiki

The companion wiki at wiki.euicc.co.uk is for shorter reference entries, definitions and acronym lookups. The main site carries longer guides and opinionated implementation notes.