Solve the problem of phone and cellular Internet failure after upgrading to iOS 17.2.1

Apple released the iOS 17.2.1 update on the 20th of last month. The internal version number of this update is 21C66. The main purpose is to fix some important bugs and solve the problem of battery draining too quickly in some cases. Although iOS 17.2.1 is only a small update, many old users, such as iPhone SE 2, iPhone 12 and iPhone 11, etc., said that the battery life after the upgrade is good. Sadly, though, some iPhone users are facing cellular connection issues after two weeks of use. This problem may affect users' network experience, but we believe Apple will solve this problem as soon as possible. With this update, Apple has also paved the way for the upcoming iOS 17.3. Users can look forward to better functionality and performance in future updates.

#According to user feedback in the Apple support community, after the iOS 17.2.1 upgrade, some users of the iPhone 15 series encountered the problem of being unable to connect to the operator’s signal. The problem prevents the ability to make calls and use cellular data.

After upgrading to iOS 17.2.1, I was unable to receive calls, reset my phone while on cellular, contacted my service provider, and changed my SIM card, including restoring it to Factory settings cannot solve the problem.

##Currently Apple has not issued any statement on this issue and is not aware of it. Whether the problem is widespread and if there are enough samples, Apple may pay attention to it and subsequently launch 17.2.2 or 17.3 updates to solve these problems.

What should I do if I can’t make calls or use cellular Internet after upgrading to iOS 17.2.1?

If you are currently facing the problem of being unable to make calls or use cellular Internet after upgrading to iOS 17.2.1, the editor recommends upgrading the system to the beta version of iOS 17.3 first.

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