Android app to aggregate 3g signals over several phones to make faster internet

My 3g internet connection just ain’t good enough. But between mine and my girlfriends 3g connections, we should have ample bandwidth. There should be a pretty simple way to aggregate the two phones 3g connections such that it increases the user experience of anyone using tethering – e.g. one phone becomes a 3g slave and the other the master, with the wifi being hosted on the master. The master then uses wifi to the slave to do some work.