Apple is officially selling unlocked iPhone 4 models.
Visitors at the online Apple Store can select from a 16GB unit for $649 or a 32GB unit for $749. Customers can choose from either white or black flavors.
Available only in the U.S., the unlocked devices are GSM-compatible, meaning users can place calls on either AT&T's network or T-Mobile's without having to sign a two-year contract for either carrier. The catch, however, is that the unlocked iPhone won't support T-Mobile 3G download speeds.
"[D]ata transmission on the T-Mobile network will occur over the slower EDGE protocol because the carrier's 3G network is incompatible with the iPhone," Apple Insider points out.Please check with Manuals. Author is NOT responsible for any misinformation / incorrect information or typographical errors. NOTE: If you would like to share any useful info, please mail to the authors.