Bill says that his phone doesn't charge while he's using Waze and is connected to USB for charging. Leo says that some chargers will divide dual USB port chargers, and as such, he won't be using all the charging capacity. Leo advises going with a single port charger and get the highest amperage model he can. That will give him enough juice to charge while he's using it. Leo recommends an Anker charger. Leo also recommends keeping his phone cool. An overheating phone won't charge.