How to format a phone number using PhoneNumberUtils?

At its most basic:

String formattedNumber = PhoneNumberUtils.formatNumber(unformattedNumber);

This will automatically format the number according to the rules for the country the number is from.

You can also format Editable text in-place using:

PhoneNumberUtils.formatNumber(Editable text, int defaultFormattingType);

Take a look at PhoneNumberUtils for more options.