after update to 15.0.2，”no 4g network” occurs everyday
was I the only one encounter this problem?
iPhone 11, iOS 15
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Yes. If you are referring to the after-effects of the iOS update.
2G, 3G, 4G, LTE, VoLTE, 5G all are Carrier Specific features. Contact your Carrier (Cellular Service Provider), the agency that issued the SIM / eSIM to you.