Help : Manual
The following devices have been recommended to me by users of Gaggle. Each of the devices below have a hardware barometer built in - which significantly improves the usefulness of Gaggle. I haven't personally used most of these devices, before comitting to purchase you might want to post on the gaggle user's forum to ask for reviews.
The links below are for unlocked phones, you can typically find them much cheaper if you get a locked phone through a carrier.
If you find other good phones for Gaggle, please post about them in our forum