I called my friend and got through, but I didn't answer, and I didn't reply to the text messages for several days. What happened?

If you get through and don't answer, it may be because you didn't bring it, or it may just be something. If you don't reply to the text messages, it may be your own problem. How are you getting along with your friends recently? No quarrel experience? If so, it is likely that your number has been blacklisted. If not, then his/her mobile phone may have been stolen.