For most of the USA, the time will change twice a year for Daylight Savings Time. If the time changes and your phones no longer match, it is often because your time zone settings are not correct.
These can be changed easily in the Customer Administration Portal.
The time zones will update for daylight savings time correctly, but there are Canadian and US versions of most time zones. Be sure to select the correct nation for the updates, as they can vary as to when the time adjustment is made.
Arizona does not change their time for DST, so they have their own time zone. This is often entered incorrectly as either Mountain time or Pacific time depending on the season. This should be adjusted to Arizona, then no further update will be necessary.