Where do they get those SIM cards sold on E-bay and claim to be preactivated and work in any unlocked phone?

I'm under contract with T-mobile and thought it would be a good option to have a prepaid Sim card when I run out of minutes.T-mobile told me I can't use prepaid Sim cards unless I purchase a pre-pay plan.


Another question,can I use my regular Sim card if I purchase a prepaid phone/plan?

Where do they get those SIM cards sold on E-bay and claim to be preactivated and work in any unlocked phone?
Just get a pre-paid plan....simple...





it works on any fone and u can keep ure old sim....just change plans.