Recently I purchased a CRT19N GPRS/GSM/GPS Watch Tracker from Daily Steals. Overall I'm pretty happy with the product, This device has a built in cell phone and can call two pre-programmed numbers. You can also send an SMS text to it and receive back a latitude and longitude along with a link for google maps. You have to purchase your own SIM card for the device along with a plan.
The device has one bug, however. You can't set the timezone and it comes preprogrammed for Beijing time so it's useless as a watch.
The device has one bug, however. You can't set the timezone and it comes preprogrammed for Beijing time so it's useless as a watch.