Can I retrieve the deleted text messages on my mobile phone?

It's absolutely possible, but you have to find an operator, which is China Mobile or China Unicom, depending on which one you use.

Because every text message we send passes through their base station, in other words, the operator's operation technicians can see the content of each text message if they want to. But legally and professionally speaking, they are prohibited from watching.

You can go to the operator, explain the situation to them, and ask them to send you the information belonging to you in a certain period of time again. It's best if you have friends who work there, otherwise most people won't do it.