20 Most Recent AT&T LG CU720 Cell Phone - Silver - Page 8 Questions & Answers

In my experience free unlock codes does not work. i recommend you to try get the unlock code from the site MobileUnlockSolutions.com Mobile Unlock Solutions The Ultimate Website For Mobile Phone Unlocking

We would not have that info here, sorry.

have you taken the battery out and reinstalled. usually resolves these type of problems. hope this helps

Hi Axel Unlocked phones are usually OPEN to use any SIM CARD! Regardless of what SIM you put, the phone is unlocked! SO you can buy a SIM from any carrier and insert into an unlocked phone and it will work.

very possible that the account has not be paid up or the prepaid has run out

I need the make and the model # of the phone, "cheapest phone" will not get the info you require. All info is under the battery.

Contact customer care and also send email to them. Ask to change your number to new number. or you can also port your at&t number to streightalk. here is how to unlock at&t mobile . How to Network Unlock Att Mobile

If it unlocked then how it got locked. with which sim card your mobile locked at&t or tmobile. You said you have unlocked mobile does it roaming lock or sim locked. it may possible that your mobile was temporary unlocked on the basis of roaming otherwise your mobile is sim locked. To unlock your at&t or tmobile smartphone you need to generate unlock code from imei number of your mobile phone. it will generate four kind of unlock code. if your mobile is hard locked then use defreeze code otherwise use nck code. here is how to unlock at&t sim for lg samsung nokia mobile at united states of america , canada and uk.

Hi @Benjmain Brink , please perform a factory reset on the phone. Please be advised that by doing a factory reset will wipe out all files on your phone. Hope this helps!

Here is two possibility either you used sim in wrong slot like you have nano sim and you used into micro sim slot or other different slot. or your mobile is sim locked and that is why it not accepting at&t sim. here is how to unlock at&t simcard. As your att sim working fine with blackberry so sim is fine no issue with sim card. on which mobile you have tried this sim as you have not mentioned your other mobile it is same as blackberry or apple or samsung mobile.

If you hung up they are gone and are unrecoverable

I suggest you can approach Theunlockarena.com and specify the country,locked network of ZTE Zmax Pro .You can get the permanent unlock service along with free instructions.

www.att.com ZTE_Maven_2_Z831.pdf user guide or www.att.com Device Support Tutorial for ZTE Maven 2 (Z831) Im sorry cant get more specific then this, answer depends on the type of service (example prepaid).