An interesting thing I read on a forum that helped one guy out.. he set his wife's number to a custom ringtone.. it was a REALLY annoying ring he couldn't stand...
THIS kept him from going near his phone, and gave him a nice warning that the call would NOT be a pleasant one.. and if his wife was calling him repeatedly, he had no choice but to turn the phone off...
HIS story was quite different, but he still didn't want to talk to his wife... and she kept calling him...