Xiaobai asks for help on how to build telecom 4G.

Hello, I'm glad to answer your question!

According to your description, in the settings of Android phones, turning on the 4g switch is still the first choice for LTE or 4g. , Apple mobile phone, set the mobile data inside to start 4g.

I hope my answer can help you, and Anhui Telecom wishes you a happy life!