My name is Roi and I'm a PhD student. As part of my research I'm interested in connecting external GPS antenna to smartphones. The antenna can be rather simple like this one: https://www.sparkfun.com/products/464
A.What (current) devices do you aware that have this option? B.Do you need to configure anything or once you connect it, it just works?
Well obviously there has to be a connector (could just be soldered though) on the board to connect the antenna, however tiny it is, but unless you wrip apart the case you won't have access to it. What is it you are trying to do exactly? If you want to improve reception and/or test the impact of a better antenna a reradiating antenna will do the job/