The Elephone P8000 doesn't work with Metro PCS or other carriers (USA)

I can't use the phone with Metro PCS in FL, it just doesn't make/receive any calls/texts.
Is it possible to fix that with a ROM or by a hardware replacement/upgrade?
Please help.
Thank you in advance

Elephone P6000 Pro MTK6753 Information Thread: Root, Recovery, ROMS and more

General information
Specification:

Official Website:
http://www.elephone.hk/P6000-Pro-3gb.html
http://www.elephone.hk/P6000-Pro-2gb.html
http://bbs.elephone.hk/forum.php?gid=283#.VghRY_lVhBc (forum)

Reviews:

Stock Rom update Elephone P7000 Android 5.0_20150914

ROM download link: https://mega.nz/#!JsIwEL6I!joG_jaZI7...kvs4aBSNcewlaY
ROM flashing tutorial: http://bbs.elephone.hk/thread-1037-1...l#.VWgkX_RAU-0

Please backup your phone before flash, OTA update will be available soon.
Changelog: optimized- battery consumption
http://bbs.elephone.hk/data/attachme...u2azsgjk26.png
http://bbs.elephone.hk/data/attachme...5cy155ucd7.png
http://bbs.elephone.hk/data/attachme...i9rv7npdiq.png
http://bbs.elephone.hk/data/attachme...u2azsgjk26.png

Elephone M2 Full Specs Revealed

The upcoming Elephone M2 along with some press photos. The device features a design that signifies a bit of a departure from the usual Elephone styling.
The Elephone M2 is now confirmed to have an octa-core MediaTek MT6753 processor with 3GB of RAM and 32GB of ROM. Depending on the time frame of the launch, will either make the M2 a full-blown flagship or a high-mid-range smartphone.
M2 will have a 5.5-inch 1920 x 1080p display from LG. The M2 will keep up with the trends and will pack a fingerprint sensor on the front (which claims to recognize fingerprints in 0.5 seconds) over the home button (which appears to be a physical button). Also on the front will be a 5 mega-pixel camera on top.
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Source: Elephone, Gizchina

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