can GSM phone sim unlock be use with verizon or sprint? - One (M8) Q&A, Help & Troubleshooting

can GSM phone sim unlock be use with verizon or sprint? I stick my htc one m8 with a verizon sim, and it doesnt detect anything, I'm not sure if I did something wrong or the band just doesnt work all together.

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Sprint version: does not disable GSM?

The Sprint version is being advertised as an international phone, and comes with a Sprint SIM card pre-installed, and what appears to be a security strap, making it difficult to remove.
Before traveling internationally, you can call Sprint ahead of time to have them active their SIM card, and for the low low price of $1.99/minute, you can use overseas GSM networks to make phone calls, and in many cases, data access.
Of course I'd like to buy a pay-as-you-go SIM card and install that for much more reasonable rates while overseas, but I'm not sure if it's as simple as plugging in a different SIM card.
I had read that the Rogers version of the phone required...something to active the SIM slot, and even then seemed not to work for data via 3G.
Anybody else have the Sprint version? Played with GSM yet?
I'm a little apprehensive to start tearing into it to remove their SIM card just yet...
The GSM is 2G only, no 3G.
Well my buddy has a AT&T sim card that i put in my TP2 but it did not work. I switch the phone to GSM only but it did not pick up a network. I also put that sprint sim on his phone but it had no network either. According to the manual its lock from going to a gsm network on the USA.
gface2k said:
Well my buddy has a AT&T sim card that i put in my TP2 but it did not work. I switch the phone to GSM only but it did not pick up a network. I also put that sprint sim on his phone but it had no network either. According to the manual its lock from going to a gsm network on the USA.
Click to expand...
Click to collapse
Hopefully a custom ROM can unlock the ability to use GSM networks in the United States!
gface2k said:
Well my buddy has a AT&T sim card that i put in my TP2 but it did not work. I switch the phone to GSM only but it did not pick up a network. I also put that sprint sim on his phone but it had no network either. According to the manual its lock from going to a gsm network on the USA.
Click to expand...
Click to collapse
good to know.
I read in the manual that it was not usable on US GSM networks too, but I assumed that was because they never intended for you to remove the Sprint SIM card, so of course the Sprint SIM card wouldn't work domestically.
So it seems the Sprint phone can be unlocked for GSM just like the Telus phones, but I haven't read of any success getting GSM 3G to work w/ an unlock code.
xnifex said:
The GSM is 2G only, no 3G.
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Click to collapse
d'oh, missed this....
What about EDGE?
Check the specs, if it said gsm 850,1900 it should be able to use with in the US. Just have to sim unlock it first in order to use.
Oh SoS said:
d'oh, missed this....
What about EDGE?
Click to expand...
Click to collapse
EDGE is 2G

HTC One - Switching from Verizon to AT&T

Hello, It is my understanding that Verizon phones are unlocked. have an HTC One phone that I would like to switch from Verizon to ATT. When I put a new sim card in the phone, it seems the ATT network is being blocked. Any thoughts?
Correct me if I'm wrong, but Verizon uses CDMA and AT&T uses GSM. The only way you'd be able to switch to AT&T with an unlocked phone if it was under T-Mobile.

[Q] Help me use verizon g3 on att

As you know, all verizon lte phones are unlocked. So I inserted a att sim card to verizon g3, im not getting ANY signal. If you want to argue that verizon lg g3 is cdma only, go google it, its compatible for both gsm and cdma. anyways back to story, I tried changing apn, settings to lte/gsm/udtp, still nothing. I tried 3 different sims, verizon sims works fine but its at&t sims im having trouble with.

LG G4 unlock for use in Mexico

Hello everyone I hope that I get a response I have an LG G4 from Verizon that is fully paid off that I want to send to my sister in Mexico her carrier is AT&T. Now AT&T is a GSM carrier in Mexico emperor what I have found it would be compatible with the network however my question is how can I unlock the LG G4 Sim card so that she can plug in her Sim card. I have found that Verizon says that all of their LTE phones are unlocked but I just want to make sure before I send her a phone that she would not be able to use if I don’t do anything and everything I need to do
Unfortunately, I don't think you will be able to use this phone with an AT&T Mexico SIM Card. If your phone was locked and used on Verizon, it means that is a CDMA device. Thus, it works only with Verizon and doesn't recognize the GSM Technology so it won't accept the AT&T Sim card.
More info on CDMA networks here: https://www.unlockunit.com/blog/cdma-networks/
I think you are better of selling this device in the US and buying an already unlocked GSM model.
myuncutworld said:
Hello everyone I hope that I get a response I have an LG G4 from Verizon that is fully paid off that I want to send to my sister in Mexico her carrier is AT&T. Now AT&T is a GSM carrier in Mexico emperor what I have found it would be compatible with the network however my question is how can I unlock the LG G4 Sim card so that she can plug in her Sim card. I have found that Verizon says that all of their LTE phones are unlocked but I just want to make sure before I send her a phone that she would not be able to use if I don’t do anything and everything I need to do
Click to expand...
Click to collapse
ask verizon to unlock it.
i have tmobile one unlocked from tmobile works great.

Getting ATT Branded S9 to work on Verizon

Is it even possible? The phone has been unlocked by ATT but when I insert my verizon sim, it only lets you make emergency calls. I realize that the cdma bands wont work, but I assumed it would work on LTE. I definitely could be wrong though. Anyone know?

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