[Q] ISIS on Gophone prepaid service with T999 S3
I have a SGH-T999, unlocked, stock, with OTA 4.3. I really want ISIS to take advantage of the 20% cashback bonus offer w/ Serve. There's no T-mobile corporate stores anywhere nearby to get the enhanced sim card, so I got an AT&T enhanced sim card instead, and activated one month of the $40 gophone service. After many hours of try to activate it and waiting on hold with AT&T support, even trying it on a AT&T branded compatible phone, the retards at AT&T finally told me that there's no way to get ISIS to work on prepaid service, only postpaid.
Is that true? Any workaround? As bad as I want it, there's no way I'm gonna pay those ba$tards at ATT the ripoff postpaid prices+activation fees for a service I only want for the mobile wallet.