How to stop some spam messages from coming in (it's annoying to send spam messages to strange numbers)

The only solution now is to buy a smart phone, such as Nokia's S60 mobile phone, and then you can install the corresponding call and SMS firewall on the mobile phone, which has two functions, white list and blacklist. Names listed in the white list can call and send messages to you unimpeded, but numbers in the blacklist can't.

At present prices, this kind of mobile phone is not expensive. 1200-2500 is available. I use Siemens SX 1, which has been discontinued now, but there are still parallel imports, as long as 1300 is enough. You can visit www.EBAY.COM.CN.