I'm currently using an iPhone 6. Recently I put my sim card to an old iPhone 5 and used it for a couple of weeks. During the time, I made phone calls and sent/received text messages. Now that I've put the sim card back to my iPhone 6, I'd like to transfer the text messages (and the call history) on the iPhone 5 to iPhone 6, without erasing the previous information on the iPhone 6. How should I do it? Please help!