After years of selling only GSM iPhone models, Apple, along with Verizon, released a CDMA iPhone 4 not long after the release of iPhone 4. GSM is used by some carriers like AT&T and CDMA is used by Verizon and Sprint. In the United States the largest GSM phone carrier is AT&T. In Canada, the largest GSM phone carrier is Rogers. This is important because the parts for GSM phones typically do not work with CDMA phones.
iPhone has many phone features, including call waiting, call forwarding, and conference calls. Depending on the wireless carrier's network technology (GSM or CDMA) you choose, the methods for enabling and using these features vary, according to explanations from Apple's support document.
|Feature||iPhone (GSM networks)||iPhone (CDMA networks)|
|Call forwarding||Turn on or off in Settings > Phone||Contact your carrier for information on using Call Forwarding|
|Call waiting||Turn on or off in Settings > Phone||Contact your carrier for information on using Call Waiting|
|Caller ID||Turn on or off in Settings > Phone||Contact your carrier for information on using Caller ID|
|Conference calls||Supports up to 5 calls simultaneously||Supports up to 2 calls simultaneously|
|Dial a soft pause||
Tap and hold * when dialing. When editing a contact number, tap +*# and then tap "pause".
|Dial a hard pause*||
Tap and hold # when dialing. When editing a contact number, tap +*# and then tap "wait".
Requires iOS 4.3 or later.
From the illustration chart we notice that call forwarding, call waiting and caller ID settings can be adjusted in the settings pane of GSM iPhones, but on the CDMA iPhone, users need to dial numbers to enable or disable the features.
Besides, GSM supports conference calls of up to five people simultaneously, while CDMA supports up to two calls simultaneously. "CDMA networks may not be able to add, swap, or merge calls in certain situations," the article noted.
When "Tap and hold Mute" GSM iPhone could place a call on hold. While, the CDMA version of the iPhone is unable to place a call on hold. The document also noted that phone numbers that contain alphabetic characters beyond seven digits "may not dial as expected." Finally, due to the CDMA iPhone's lack of a SIM card, several SIM card-related features are unavailable on the CDMA iPhone.
From appearance, the iPhone 4 GSM will always have a SIM card tray. The SIM card tray is located on the right side of the mid-frame. And yes, there is a black line near the bottom, but it's like that on all of the iPhones. You will notice on iPhone 4 CDMA there are 2 black lines located at the top of the mid frame on both the left and right side.
Many users wonder which iPhone model Tenorshare iPhone Data Recovery supports. Well, the latest update makes it possible for the program to recover data from both iPhone 4 GSM and iPhone 4 CDMA. You can free download the trail version to have a try and see how it recovers your iPhone 4 photos, contacts, videos, call history and other iPhone data.