ZTE maven Z835

earld14earld14 United StatesPosts: 1

Bought a used ZTE 835 at a store in SD and was told it was unlocked. Arrived in Scotland, bought a giffgaff package, inserted the SIM and the phone was locked to ATT due to a 6 month contract not being paid out. Worked with ATT live chat and was able to get the phone unlocked but now it will not connect to the network. Took it to a phone repair place where the owner put the sim out of his personal phone in my phone and still no network connection. I would like to make one last try and update the system software but I do not know how to go about it. It is currently on android version 7.1.1.

The only update ability seems to be AT&T Software Update but it says the phone is up to date. Any ideas?


  • sshasansshasan Staff Member United States Posts: 4,078 admin
    edited April 9, 2019 11:46AM


    The latest build for the Z835 is Build number: Z835V2.0.0B14

    The issue you are most likely running into is band compatibility. The service GiffGaff uses 800MHz, 1800MHz, 2100MHz and 2300MHz while the Z835 main bands are 1900, 1700, & 850. They just are not compatible.

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