Depending on the attachment though.
1mbps should be plenty to download email. Remember that's Sprints and Verizons CDMA 3G speeds on the regural without being on the phone

About Tmobile Im also looking at them once they continue their refarming. Would be nice if they did LTE on the same bands too but Im not pushing it. Their prices are great and if we can get fast HSPA+ with the iphone then why not.