Will an iphone work on the T-mobile pre paid plans?

The 30 dollar one and the 50 dollar one

http://prepaid-phones.t-mobile.com/monthly-4g-plans

Added (1). Does 3G work for iphone in Santa Barbara CA? If not how long do you think it will take until it comes to that city?

As long as your iPhone is unlocked.

Yes they will, but you may not get high speed data since AT&T and T-Mobile use different mobile frequencies. You will also have to get your phone unlocked as well if you want to use it on T-Mobile.

HOWEVER< T-Mobile is refarming their network to the 1900 Mhz band which will allow you to use your iPhone and get higher data speeds (up to 4G HSPA+ for the newer iPhone models) in some areas (and growing).To find out if you have the 1900 Mhz refarmed towers in your area, please refer to the link in the source below.

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