What makes it not compatible with the GSM version?
1666214
The battery compartments in the GSM vs CDMA (Sprint/Verizon) variants have different dimensions. ZeroLemon should be coming out with a battery compatible with the GSM version soon.
1666215
There is an OEM configuration difference in the batteries between the two platforms. Strange isn't it?
1666216
According to my research the form factor of the GSM version is slightly different which prevents this uniquely designed battery from fitting. I do not believe there is any technical difference. The Zero lemon is a very large an unusually shaped extended battery.
684753
It works with gsm carrier. Also, android updateable up to gingerbread. No more
2153226
It is a gsm phone, it is not compatible with cdma networks like verizon or sprint.
671346
Mine works fine. Unlocked GSM phone will work with any ( Provider's) SIM. Check the frequencies of the GSM networks used in your country. Should be one of these: 850 / 900 / 1800 / 1900MHz GSM&EDGE; Band850 / 1900MHz 3G Band ( See Technical Details)
267102
Check the bandwidth on the "Technical Specification" section of the phone. Next check the bandwidth that your carrier in your country works on, and if they are the same, they are compatible. You can also do your own research online to figure it out.
1713677
COMPATIBLE WITH / WORKS WITH SIM 1: 2G GSM 850 / 900 / 1800 / 1900 AND/OR 3G UMTS 900 / 2100 SIM 2 : 2G GSM 850 / 900 / 1800 / 1900 Only (No 3G) Please Check and verify with Your network provider the Compatibility Before You Buy. Thank you. KICKmobiles
1466472
Yes, It works worldwide with GSM 2G/3G/4G network with the following frequencies:2G Network GSM 850 / 900 / 1800 / 19003G Network HSDPA 850 / 900 / 1900 / 21004G LTE Network 800 / 850 / 900 / 1800 / 2100 / 2600Please verify with your carrier if the frequencies listed are compatible with your GSM network.Thanks!Straight Trading.
1036160
As far as I know and I've done extensive investigation on this matter, no. For further explanation, this phone is not GSM, it is CDMA, a proprietary system that may be more secure, but cannot be used on another carrier and cannot be unlocked. See http://www.pcmag.com/article2/0,2817,2407896,00.asp for further details.
303097
Any GSM carrier world wide, will not work on CDMA network's like sptint, verizon......
2078252
Sorry, but I can be of no help (don't know what GSM stands for). I bought the Big Button base phone and a phone with charger companion for the bedroom, and those two work fine. Again, I 'pologize.
2120518
It's reported that they use sprint cdma so this phone is not compatible. It uses a sim card yo access gsm networks
928257
GSM, takes a SIM card (actually 2 SIM cards), will not work with CDMA which is a different and incompatible cell phone radio standard.
415161
Yes it should be compatible with all GSM carriers . We have met with best success with AT&T ,T-mobile ,Net 10 , Ultra Mobile, Simple Mobile, Telcel, Red Pocket Mobile and h2o mobile. Verizon and Sprint are CDMA and will not be supported with this phone. Hope this helps. Thank you for taking the time to ask me questions.
1355259
Sorry, can't help. I returned the system. Once I received it and read the manual, I realized that it was incompatible with my cell phone service.
1633382
This is an issue of carrier more than phone. The phone will work on any GSM carrier.Movilnet, Movistar and Digitel, Venezuela's three major cell networks (according to Wikipedia) all should be compatible with this phone
352020
as long as there is a GSM Network available, it works. Make sure the phone is unlocked.
2215862
I remember researching that and buying the phone because I was told it would be compatible. Unfortunately I couldn't tell you with certainty because I never unpackaged the phone. We installed a digital phone system in our office shortly after buying the phone which required specialized proprietary phones. I have been meaning to list it on the site for resale but have been putting it off. Let me know if you would like to make me an offer and I can sell you mine (stil unopened in its original packaging).