If you have to write a lot of text or e-mails, the keyboard on the touchscreen limits the view on the document. For such cases, I carry my external keyboard with me. With it, my phone becomes in seconds a productivity workstation.
It is folded by half and the phone holder are adjustable for all phone sizes. I prefer it over other keyboards without phone holders, as you usually need to tilt the phone to easily read the screen. For me the perfect accessory and gift for all phone owners for Christmas!
Try it out and order it at Amazon.