Well it was working for months before this happened, the moment I put the sim card in the texts were coming and they kept coming for months, now i can still call but no texts!?Welcome to Android Central Forums.
Did you check with your mobile provider to see if the Aio A08 is compatible with their network?
Just a thought...
Tried no luck, tried messing with alot of settings no luck either, switching to 3 g 5 g , sending texts to enquire my balance, airplane mode on and off, etcPhones is funny things. They sometimes stop doing things for reasons not apparent to the user. The first thing to try is a Power Off & Restart.