Should Iphone Be Turned Off When Charging . An Apple iPhone should charge without any problem when it is connected using its USB cord. Sometimes it can be a good idea to let your iPhone battery drain If your iPhone won't charge unless turned off, it can mean that you have a faulty battery or your iPhone has software or hardware issues. 49 SYMBOL BY BATTERY ON IPAD, IPAD SYMBOL BY ON BATTERY (Jeffrey Meyer) Here's what to look out for to. iPhone won't charge when it turns on? The charging port, charger and cable should all be fine. An iPhone that keeps turning off can be caused by faulty apps, water damage, or (usually) battery issues. Before you plug your phone in to start charging, you may want to remove the case. iPhones are able to charge more efficiently when they're kept in the right temperature. When I start looking out for what all things to when my iPhone was not charging the first page opened by me were this.