> Really? It's never insisted upon for any core service? You might need to qualify "core service" here, but no. Calls, SMS, MMS, internet all work fine without

> Really? It's never insisted upon for any core service? You might need to qualify "core service" here, but no. Calls, SMS, MMS, internet all work fine without an account. You need an account to download apps from the app store, but that's a different argument. If you wanted to, there are various methods to load apps up without an account too (side loading via Xcode, MDM, etc).