According to your description, if you only use E-mail when your mobile phone is disconnected, there is no problem using other software networks. I suggest you try to update Yixin to the latest version. If not, try uninstalling Yixin and reinstalling it.
Anhui Telecom will serve you wholeheartedly, and I hope my answer can be adopted by you.
Telecom iPhone6 is fully netcom, officially listed on June 18+07, and you can get 400 by making an appointment for deposit through Anhui Telecom's online business hall 100 immediately.
If you have any questions, please consult the staff of Anhui Telecom's online business hall. Wish you a happy life!