I had this problem with my data -- the APN settings of your provider likely did not port. Best to google the APN settings for your provider and input them in the APN settings dialog in the Wireless Networks Settings
Just as Shifty wrote - check and re-check the APN settings. Or remove all of them and then enter them manually (after google-ing for settings if you don't know them by heart.)
As far as the chinese characters are concerned, you have "fixed" themes here (in the 1st post there are two links - one for GB, the other one for ICS). Download & install this. It's just the lockscreen package so that you have "proper" english date on your lockscreen.