application is the fact that it is compatible with many different phones and service providers. Here is the compatible phone list, to date.
HTC 2125 / 2100 (Faraday) - AT&T (Cingular)
HTC 3125 / Smartflip / 8500 (Star Trek) - AT&T (Cingular)
HTC 8125 / 8100 / MDA (USA) / K-JAM / P4300 (Wizard) - AT&T (Cingular)
HTC Tilt 8925 / TyTN II (Kaiser) - AT&T (Cingular)
HTC TyTN / 8525 / JasJam (Hermes) - AT&T (Cingular)
Motorola Q Global / Q9h - AT&T (Cingular)
Samsung Jack i637 - AT&T (Cingular)
Samsung Propel Pro SGH-i627 - AT&T (Cingular)
Samsung BlackJack II SGH-i617 - AT&T (Cingular)
HP iPAQ Glisten - AT&T Wireless
HTC Touch Pro2 (GSM) - AT&T Wireless
HTC Fuze / Touch Pro (GSM) - AT&T Wireless
LG CU515 - AT&T Wireless
LG eXpo GW820 - AT&T Wireless
LG Shine CU720 - AT&T Wireless
LG Trax CU575 - AT&T Wireless
Motorola KRZR K1 - AT&T Wireless
Motorola RAZR V3 - AT&T Wireless
Motorola RAZR V3i / V3t / V3e / V3r - AT&T Wireless
Motorola RAZR V3xx - AT&T Wireless
Motorola SLVR L7 - AT&T Wireless
Nokia 6555 - AT&T Wireless
Palm Treo 750 - AT&T Wireless
Pantech C3b - AT&T Wireless
Pantech Duo C810 - AT&T Wireless
Pantech Matrix Pro C820 - AT&T Wireless
Research In Motion BlackBerry Curve 8520 - AT&T Wireless
Research In Motion BlackBerry 8700 - AT&T Wireless
Research In Motion BlackBerry 8820 - AT&T Wireless
Research In Motion Blackberry Bold 9000 - AT&T Wireless
Research In Motion BlackBerry Curve 8300 - AT&T Wireless
Research In Motion BlackBerry Curve 8310 - AT&T Wireless
Research In Motion BlackBerry Curve 8320 - AT&T Wireless
Research In Motion Blackberry Curve 8900 - AT&T Wireless
Research In Motion BlackBerry Pearl 8100 - AT&T Wireless
Research In Motion BlackBerry Pearl 8110 - AT&T Wireless
Research In Motion BlackBerry Pearl 8120 - AT&T Wireless
Samsung Access A827 - AT&T Wireless
Samsung BlackJack SGH-i607 - AT&T Wireless
Samsung SGH-A227 / A226 - AT&T Wireless
Samsung SGH-A717 - AT&T Wireless
Samsung SGH-A727 - AT&T Wireless
Samsung SGH-A737 / SGH-A736 - AT&T Wireless
Samsung SGH-A777 - AT&T Wireless
Samsung SGH-D357 - AT&T Wireless
Samsung SGH-D407 / D347 - AT&T Wireless
Samsung SGH-P777 - AT&T Wireless
Samsung SLM SGH-A747 - AT&T Wireless
Samsung SYNC SGH-A707 - AT&T Wireless
Sony Ericsson W300 / Z530 - AT&T Wireless
Sony Ericsson W580 / S500 - AT&T Wireless
Sony Ericsson Z310 - AT&T Wireless
Sony Ericsson Z520 / Z525 - AT&T Wireless
HTC 5800 / Fusion / S720 - Qwest Wireless (Verizon)
HTC Mogul / XV6800 / PPC6800 / P4000 - Qwest Wireless (Verizon)
HTC Hero (CDMA) - Sprint
HTC Snap S511 (CDMA) - Sprint
HTC Touch Pro2 (CDMA) - Sprint
HTC Mogul / XV6800 / PPC6800 / P4000 - Sprint
HTC Touch (CDMA) / XV6900 - Sprint
HTC Touch Diamond - Sprint
HTC Touch Pro (CDMA) - Sprint
LG Rumor2 / Banter / UX-265 - Sprint
LG Fusic / LX-550 - Sprint
LG Lotus / LX 600 - Sprint
LG LX-160 / Flare - Sprint
LG Muziq / LX-570 - Sprint
LG Rumor / Scoop / UX-260 - Sprint
Motorola L7c - Sprint
Motorola Q9c - Sprint
Motorola RAZR V3m - Sprint
Motorola RAZR2 V9m - Sprint
Motorola Red RAZR - V3m - Sprint
Palm Treo Pro (CDMA) - Sprint
Palm Treo 700w - Sprint
Palm Treo 800w - Sprint
Research In Motion BlackBerry 8830 - Sprint
Research In Motion BlackBerry Curve 8330 - Sprint
Research In Motion BlackBerry Curve 8350i - Sprint
Research In Motion BlackBerry Pearl 8130 - Sprint
Research In Motion BlackBerry Tour 9630 - Sprint
Samsung Ace SPH-i325 - Sprint
Samsung Instinct M800 - Sprint
Samsung M510 - Sprint
Samsung MM-A900 / SPH-A900 / Ace - Sprint
Samsung SPH-Z400 - Sprint
Sanyo Katana DLX / 8500 - Sprint
Sanyo Katana II 6650 - Sprint
Sanyo MM-7500 - Sprint
Sanyo SCP-3200 - Sprint
Sanyo SCP-7050 - Sprint
Sanyo SCP-8400 - Sprint
UTStarcom PPC-6700 / XV-6700 / HTC Apache - Sprint
HTC 5800 / Fusion / S720 - Sprint / Nextel
HTC Mogul / XV6800 / PPC6800 / P4000 - Sprint / Nextel
Motorola Q - Sprint / Nextel
HTC 8125 / 8100 / MDA (USA) / K-JAM / P4300 (Wizard) - SunCom (T-Mobile)
HTC Dash / S620 / S621 (Excalibur) - SunCom (T-Mobile)
HTC MDA Compact / xda II mini / JAM (Magician) - SunCom (T-Mobile)
HTC Dash 3G / Snap - T-Mobile
HTC myTouch 3G / Magic - T-Mobile
HTC Nexus One - T-Mobile
HTC Touch Pro2 (GSM) - T-Mobile
HTC 8125 / 8100 / MDA (USA) / K-JAM / P4300 (Wizard) - T-Mobile
HTC Dash / S620 / S621 (Excalibur) - T-Mobile
HTC G1 - T-Mobile
HTC Pocket PC Phone (Space Needle) - T-Mobile
HTC SDA (USA) / SP5m (Tornado) - T-Mobile
HTC Shadow - T-Mobile
HTC Shadow (2009) - T-Mobile
HTC Wing / P4350 (Herald) - T-Mobile
Motorola RAZR V3i / V3t / V3e / V3r - T-Mobile
Motorola W490 / W510 / W5 - T-Mobile
Nokia 5300 - T-Mobile
Nokia 6126 / 6131 / 6133 - T-Mobile
Research In Motion BlackBerry 8700 - T-Mobile
Research In Motion BlackBerry 8800 - T-Mobile
Research In Motion BlackBerry 8820 - T-Mobile
Research In Motion BlackBerry Curve 8320 - T-Mobile
Research In Motion Blackberry Curve 8900 - T-Mobile
Research In Motion BlackBerry Pearl 8100 - T-Mobile
Research In Motion BlackBerry Pearl 8120 - T-Mobile
Research In Motion BlackBerry Pearl Flip 8220 - T-Mobile
Samsung Behold II - T-Mobile
Samsung Katalyst SGH-T739 - T-Mobile
HTC Mogul / XV6800 / PPC6800 / P4000 - U.S. Cellular
Motorola Q - U.S. Cellular
Motorola Q9c - U.S. Cellular
HTC Droid Eris - Verizon Wireless
HTC Ozone - Verizon Wireless
HTC Touch Pro2 (CDMA) - Verizon Wireless
HTC 5800 / Fusion / S720 - Verizon Wireless
HTC Mogul / XV6800 / PPC6800 / P4000 - Verizon Wireless
HTC Touch (CDMA) / XV6900 - Verizon Wireless
HTC Touch Diamond - Verizon Wireless
HTC Touch Pro (CDMA) - Verizon Wireless
LG enV Touch VX-11000 - Verizon Wireless
LG enV2 (VX-9100) - Verizon Wireless
LG VX-5300 / UX-245 / AX-245 - Verizon Wireless
LG VX-5400 - Verizon Wireless
Motorola Devour - Verizon Wireless
Motorola Droid A855 - Verizon Wireless
Motorola Q9c - Verizon Wireless
Motorola Q9m - Verizon Wireless
Palm Treo 700wx - Verizon Wireless
Pantech PN-820 - Verizon Wireless
Research In Motion BlackBerry 8800 - Verizon Wireless
Research In Motion BlackBerry 8830 - Verizon Wireless
Research In Motion BlackBerry Curve 8330 - Verizon Wireless
Research In Motion BlackBerry Pearl 8130 - Verizon Wireless
Research In Motion BlackBerry Pearl Flip 8230 - Verizon Wireless
Research In Motion BlackBerry Tour 9630 - Verizon Wireless
Samsung Gleam SCH-U700 / Muse - Verizon Wireless
Samsung Saga i770 - Verizon Wireless
Samsung SCH-i760 - Verizon Wireless
UTStarcom PPC-6700 / XV-6700 / HTC Apache - Verizon Wireless