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What is the reason why Apple's mobile phone failed to send messages abroad?

The reason for this is the following:

1. Does the international short message contain prohibited or sensitive information?

2. The content of international short messages is too long

3. Incorrect international SMS coding

4. Irregular international short message platform

Usually, Apple mobile phone can't send short messages, because the signal error is very common. If there is no signal, you will not be able to send short messages.