When you’re trying to send a message, you may have noticed an error message saying that you can’t send the message on O2. This can be a huge hassle, but there are some things you can do to get it working again. Firstly, check your sender ID. It can be wrong, depending on the country that you’re in. Also, make sure that you add the plus (+) sign before the number. If all of these steps do not fix your issue, you’ll have to contact the O2 customer support centre.
The problem is not as severe as it seems, and can be easily fixed. If your phone is running out of storage space, you can try rebooting it. This will refresh your mobile connection and allow you to send text messages again. Next, you can try deleting all apps that are running on your phone and powering it off for about three minutes. After a few minutes, try sending the message again.