3 ms·
Not off the top of my head, but I remember the iPhone in its early years required specific carrier support because of that permanent APNS connection. Can't find
by smileybarry 3y ago
Not off the top of my head, but I remember the iPhone in its early years required specific carrier support because of that permanent APNS connection. Can't find a source for this now but I remember that being one of the reasons that iPhone 2G/3G/3GS wouldn't work (well) on other carriers even after SIM unlocking.
I assume nowadays it's more to do with GCNAT pruning connections to APNS/GCM less heavily than other "regular" connections (which is doable given that APNS has specific ports[1]), or cell carriers having different routing & handling for push notifications IPs, but that's just speculation.
1: https://support.apple.com/en-us/102266 https://support.apple.com/en-us/102266