Today I noticed that my modem has actually a wifi. Its model is ZTE ZXDSL 831CII. It has logo on ptcl on it. It shows PTCL-BB as wifi connection. When I try to connect it requests password which I dont have. It also says that you can connect by pushing a button on router. (it doesnt have any besides reset). Also by going through 192.168.1.1 there is no configuration for wifi.