Hi, I would just like to mention that I am currently using a RFV16 for my emotion EVO. It fits nicely in the place designated for GPS tracker in the EVO frame below the battery. GPS+GSM+GPRS. Needs clear view to get accurate position, if no GPS signal it provides coordinates for the connected base station. Can be controlled by sms, app or website. Batterytime not so good, but I am working on a solution as the evo model already have a cable from the battery made for this purpose.
Just Google RF v16 and you'll find it. It's also cheap.