We met many crashes like below on iOS 15, it seems multi-thread issue EXC_BAD_ACCESS. We get the dataServiceIdentifier on different threads. Does CTTelephonyNetworkInfo not thread-safe anymore from iOS 15? 0 libobjc.A.dylib _objc_retain 1 CoreTelephony -[CoreTelephonyClientMux cachedValueForSelector:] 2 CoreTelephony -[CoreTelephonyClient(Data) getCurrentDataServiceDescriptorSync:] 3 CoreTelephony -[CTTelephonyNetworkInfo dataServiceIdentifier]

how can I prevent apple connect from logging off?

https://stackoverflow.com/questions/46661363/driving-activity-confidence-is-low-all-time-in-ios-11 I want to keep high confidence long time interval for deviceMotionUpdateInterval Makes high confidence?

App crash while using cellular network with low signal points calling NSURLSession ? here I have attached TestFlight crash log . crashlog.crash