My 5s telecom version can't send short messages by inserting a telecom card! I didn't know there was no SMS service center until I checked. Please disconnect it!

Hello! I hope the following answers can help you.

The number of short message center of telecom mobile phone is built into the system firmware, and it does not need to be set manually. In the situation you described, it is suggested to take out the telecom card and change it to a mobile phone for testing. First, confirm whether the phone or the card is faulty. Mobile phone cards can be replaced in the business hall, and mobile phones can be connected to computers to update firmware with ITunes.

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