OW texted a love poem to my WH 2 months after he first messaged her that it was over and we were working on our marriage.
We went the next day and had his number changed. No big deal. No questions asked. Apparently people do it all the time.
His phone was messing up so we got a new one of those as well (two months early on the contract but the fee was waived), so when people asked why the new number, he just said he'd gotten a new phone. Sometimes he would jokingly say he was making sure the bill collectors couldn't find him. Most people didn't ask.
As for OW, we unblocked her temporarily from facebook and sent another NC message while she was online more strongly worded and told her his number was changed. She claimed it had been an "accident" while she was deleting messages and she respected his decision and wouldn't try to contact him again. Yeah right