Why can't I send text messages when my iphone4s has changed its telecom card?

Hello, Anhui Telecom will answer your questions.

I hope the following content can help you.

Check whether the SMS center number in the information settings is correct. You need to call the local customer service to get the number of the SMS center, and then fill in the format:+861xxxxxxxx.

Visit Anhui Telecom's online business hall to buy your favorite mobile phone, participate in activities such as deposits and gifts, and handle more discounts, lower discounts and diverse package combinations in the online business hall.

We will inform you of the latest preferential activities through the online business hall of Anhui Telecom and the official Weibo as soon as possible.

I hope my answer can be adopted by you.