You can't send text messages after using the card in the US version of 4s.

Enter the phone number in the settings and find that the default phone number is 000000. It should be enough to manually change it to your own number. The main reason for this situation is that the mobile phone can't automatically get the phone number from the SIM card because of the cooperation between the mobile phone and the SIM card, and the mobile phone short message sending service must need the phone number, so it can't send short messages. Try it, it can usually be solved.

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