He Xin he-f4 mobile phone, why does sending a text message to a number far away from you always show that sending failed?

There are many reasons for sending failure:

1, far away from yourself? If you were in Xinjiang some time ago, it is likely that the satellite blocked the wireless signal. Forget your message. Only military channels can use wireless devices. I sent a short message to my classmate, and it took him a month to receive it.

Make sure there is nothing wrong with your mobile phone.

3. Make sure there is nothing wrong with the mobile phone number of the receiver.

4. Call 10000 and ask them to check whether your area is a blind spot.

5. Have you enabled SMS on your mobile phone card?

Wait, wait, wait. I'll give you a supplementary answer when I think of it.