Once again T-Mobile retail stores are receiving small shipments of MicroSIM cards to be used for non-T-Mobile devices, likely the iPhone 4. Each retail location will receive ten MicroSIM cards and they are $9.99 as a replacement SIM or free if activated with a new purchase. Of course you can always purchase the MicroSIM through T-Mobile.com just in case your local retail store sells out. iPhone 4 users should of course take note that 3G is not available through T-Mobile due to the different frequencies between AT&T and T-Mobile. In any case, MicroSIM’s are available at your local retail stores, so now you know.