Hi moni_qwerty, I'm developing an app for a BLE smart device, (iPhone is Central and a BLE device is Peripheral) just like you did. Now I've facing the same problem as you. My app works perfectly on iPhone 6S and phones before, but when connecting to the Peripheral device by iPhone 7/8/X, it always time out and cannot get services. BTW, all my phones runs on iOS 14.4.May I know how did you solve this problem? I'd relly appreciate it if you can give me some clues. My email is imran.khan@safectory.com. Thanks! Imran