ALPS F25( also known as SURE F25, Broadnet BN-01+, GQT F25, and ZELLO Phone 2 ) 

I'm not really a familiar with the f22 but from what I gathered from an ad on dhgate the f25 has the quad core and the f22 has dual core processor. F25 RAM 1GB, ROM is 8GB. F22 RAM 512, ROM is 4GB. F25 Cameras are 2.0MP(front), 8.0MP(back). F22 2.0MP, 5.0MP. As far as Android OS I don't know which version the F22 has but my F25 has 5.1

F25 is 4g LTE too, while the F22 is 3G

Mine works with T-Mobile 4G. Have you tried putting the SIM card in the second slot?

No, I have on T-Mobile(US).

Are you used on lte B12 on TMO?

I don't know which one it's on, my phone just shows "LTE"

If you mean like a regular walkie talkie, No.

I don't know if it works with eschat. I downloaded the app but it requires an account to use the app.

Thanks, I was not sure if it had a disabled FM chip or no chip at all.