well my problem is that I have lots of apps and I dont want to factory rest. and if I make a backup of all my apps, wouldnt the problem occur again?
I pretty sure that its not for spam filtering. because both messaging and go sms spam filters are off. and besides, there is no sms in their spam folder. to be sure, I checked my applications in application manager, and looked for apps that have "your messages" permison. and there werent any app that looked causing the problem.
and I dont know how apn setting could do such thing. can you explain what should I look for? my apn setting looked ok. I have been using it for long. the only strange thing was, in the latest rom ( I dont remember wich ones exactly.) apn setting wanted me to fill MCC and MNC. wich I didnt know because I never had to know. so I looked it up and MCC for my carrier was 432 and MNC was 11. and they are working fine. could this cause the problem?
solved. sombody had made a folder in go sms, in filter folders. and every sms from strangers were there. its diffrent from spam blocking, thats why I didnt find it there.