Something Wrong With My Line

Not really sure it is only me or other will have the same problem too. My HP line on Friday and Saturday had some problem. Its like suddenly the line will disapear and it will show "looking for network" or they will show the phone which has a line cancel it showing that it is not working. I have to restart so many times that even after restart also cannot work. When I try to make a phone call on Sat, I cannot even get connected. Really weird. I guess the cell phone line should stop sending us their promotion sms and make their line work nicely 1st..