Every eSIM chip on Earth has a unique, 32-digit name: and SGP.29 is the rulebook that keeps them straight
Every dollar bill has a unique serial number. Every book has a unique ISBN. And every eSIM chip has a unique EID: a 32-digit fingerprint. No two chips on the entire planet share the same EID. It's how the eSIM world knows exactly which chip it's talking to!
Before SGP.29, EIDs were a mess. They used a credit-card numbering system, different countries had different rules, and nobody could guarantee names were truly unique worldwide. In 2019, they said "Enough!" and made the GSMA the central librarian for all EIDs.
SGP.29 sets six golden rules for EIDs. The most important: an EID's one job is to uniquely identify one chip: period. It's NOT a payment account, NOT for billing, and definitely NOT linked to old SIM cards. The EID says "I am Chip #12345...": it does NOT say who owns it.
Your phone number changes when you switch carriers. Your IMEI changes when you get a new phone. But the EID? It stays the same forever: from the factory floor to the recycling center. It survives resets, profile changes, even factory wipes. That's why SGP.29 takes it so seriously!
There are enough possible 32-digit EIDs to give a unique name to every grain of sand on Earth: billions of times over! The numbering space is deliberately enormous so we'll never, ever run out. SGP.29 thinks ahead!
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