1. buy a GSM module. The cheapest ones don't even have GPRS. Ex - wavecom fastrack go. (http://www.wavecom.com/modules/movie/scenes/products/index.php?fuseAction=wirelessCPU&productName=fastrack_GO)
2. Write a small application on the module to do the following:
i. read the location using LBS(location based service) on the GSM network. It basically gives you the cell-id of the nearest GSM cell site (200m-1km accuracy)
ii. send out an sms after every hour containing the location
Total cost = $20-$30 for the module + $30 for a pre-paid sim card + $0.15/sms
Slashdot Mirror
1. buy a GSM module. The cheapest ones don't even have GPRS. Ex - wavecom fastrack go. (http://www.wavecom.com/modules/movie/scenes/products/index.php?fuseAction=wirelessCPU&productName=fastrack_GO)
2. Write a small application on the module to do the following:
i. read the location using LBS(location based service) on the GSM network. It basically gives you the cell-id of the nearest GSM cell site (200m-1km accuracy)
ii. send out an sms after every hour containing the location
Total cost = $20-$30 for the module + $30 for a pre-paid sim card + $0.15/sms