My mobile phone sent a text message to A, but A couldn't receive it. A Text me, I can get it. What happened?

There should be something wrong with the setting of your mobile phone card, because your mobile phone will not have this problem if it is replaced by A card. You try to send it to others. If others can't receive it, you can try to find it yourself. There should be a set place! ! Or you can go to the mobile business hall to ask, the mobile staff know the machine better, I have never used your model, and I don't know where to set it up.