Telecom SMS shows that it is being sent.

Hello! I hope the following answers can help you:

According to your description, the first possibility: he is out of town and his mobile phone can't roam, so he can't receive it.

The second possibility: his mobile phone short messages are full, and he must delete some of them to receive them.

The third possibility: he set your mobile phone number to the SMS blacklist. You can send it, but he can't receive it.

According to your question, I suggest you call 10000 manual service on your mobile phone for inquiry.

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Wish you a happy life! I hope my answer will help you and be adopted by you!