Overview of ZTE OBSIDIAN Z820 mobile phone


The front of the Obsidian features a thick black bezel and a large bottom lip with capacitive buttons. The buttons aren't backlit and lack haptic feedback. They're a bit more difficult to use than they should be.

The edges of the phone are glossy black plastic. There's a 3.5mm audio jack up top, a volume rocker on the left, and, oddly, a micro USB charging port on the right, above the power button. The back panel is gray plastic, and peels off to give you access to a removable battery, card slot, and a microSD slot that worked with a 64GB Leef Pro cardBest Price at Amazon, but nothing with a higher capacity.

The Obsidian's 4.5-inch, display isn't impressive. It's reasonably clear head-on, but viewing angles are poor. Slight shifts of will wash out the screen, making text unreadable. And you can only use it outdoors if you set the brightness to max and squint.





Unlock Tmobile ZTE OBSIDIAN mobile phone to be used on any supported provider such as:


Vodafone, Claro, Three, Digicel, Telcel, O2, Telenor, Optus, Tele2, Rogers, Fido, Orange, Bell, Virgin, Telus, Koodo, Chatr, AT&T, T-mobile, Everything Everywhere, etc








How to unlock ZTE OBSIDIAN with Device Unlock App installed


Cellcorner offers several ways to unlock ZTE OBSIDIAN smartphone.



1. Wholesalers and cell phone shops who handle volumes of mobile devices will make use of phone servicing and unlocking equipment. As the biggest US distributor of such equipment Cellcorner can find the best match for your needs.
"Unlocking box" is a piece of hardware usually bundled with software that is capable of performing a range of function such as unlocking, user password removal, screenlock removal, flashing, imei change (repair), language change, rooting, tweaking various phone functions, bootloader repair, reviving hardbricked phones (unbricking, unhardbricking), and so on and so forth.

Forensic capabilities of our phone service equipment found their way to intelligence and law enforcement community and are widely used by private companies and government organizations to retrieve information from locked and disabled handsets.

Using the following unlocking equipment you can unlock unlimited quantities of ZTE OBSIDIAN cell phone

Sigma box






2. Remote unlocking via "Device unlock" App is performed on the service provider's side. No phone disassembling or technical knowledge is required.
This is an easy to perform service for phones with "Device unlock" app installed. All you need is an internet connection and original T-mobile sim card.




  1. Locate on your phone and launch the “Device Unlock” App
  2. Press “Continue” then “Permanent Unlock“
  3. The device will show “Unlock Failed“, followed by an error:
  4. If you receive “Not Eligible for Unlock”, you can proceed to using this service
  5. If you receive “Communication Error” or “Server not responding”, do not submit your order as it is NOT supported for unlocking
    Unlock T-mobile ZTE OBSIDIAN with Device Unlock App

  6. Enter all required information
  7. Shortly after you will receive confirmation that your phone is unlocked
  8. Follow same steps as above to permanently unlock your phone using “Permanent Unlock“ option