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The card, available here, carries a $9.99 suggested retail price, but is free with a two-year contract with the carrier. iPhone users have been able to access T-Mobile with an unlocked iPhone since June.
Roger Entner, an analyst with Recon Analytics, says iPhone users can access T-Mobile by getting a normal SIM card cut to a Micro SIM card at phone shops.
iPhone users on T-Mobile don’t get access to a 3G network and can’t use Apple's visual voicemail. Despite those limitations, T-Mobile claims to have more than 1 million iPhone users on its network.