I play on this when I'm away or when the GF camps the desktop PC:
http://www.amazon.com/gp/product/B00...ef=oss_product
Also, when playing where Wi-Fi is unavailable, I use my blackberry as a modem on T-Mobile's 2G network, with no problems. Their 3G network is supposedly faster but I don't notice a difference, and 3G is more likely to disconnect with its poorer coverage.