I have been all android (I have Note 4 and Huawei Mate 7) but I have been looking for a small good quality phone as a backup. None of the really small android phones that work on Tmobile have impressed me so I was thinking about getting a refurb Iphone (I have been wanting to use an Iphone anyway). I have read that the 5s is quite a bit faster than the 5 and I do not want to get a phone that cannot run the latest updates. With the new Iphone coming out I assume prices on the 5 and 5s might drop a bit. Is the 5s worth the extra $150 or more over the 5. Thanks. Bill