Beware if you buy a Trackimo. I bought one recently and it worked fine, but I read here that they only recently came out with a 3G version. The one I bought just a few weeks ago on Amazon was a 2G version, as are the overwhelming majority of units currently being sold. So when 2G is no longer supported by the cellular carriers, your unit will be useless. 2G is already being phased out in a lot of places. Basically many retailers are just unloading old stock which will soon be worthless. You can buy a 3G unit directly from Trackimo for $179. I was able to return the 2G unit I bought from Amazon because I learned this before 30 days had passed. I think it is shameful that all of these vendors are engaging in what I consider basically to be rip-off tactics.