People who move a fair amount in their lives have trouble staying in touch, especially by phone. Every time they get a new address, they get a new phone number. That makes it hard for all but their closest friends to keep track of them. A recent Voxbone survey showed how much of a problem that can be over time. The survey found that some 26 percent of respondents had had more than 20 phone numbers in their lives. And 70 percent had lost contact with people as a result of changing phone numbers.