Is it illegal to send spam messages on mobile phones?

Sending spam messages is definitely illegal. It is recommended not to try it, if you are harassed by spam messages yourself.

Then you can use Tencent mobile phone housekeeper to hack him.

Just use the anti-harassment function of Tencent Mobile Manager.

Specific steps:

Search for "Tencent Mobile Manager" through the app store-download and install Tencent Mobile Manager-open Tencent Mobile Manager-security protection-harassment interception-click "intercept" in the upper right corner-add blacklist-finish.

After the above operation, you won't receive harassing calls and text messages of relevant numbers again.