M7 no option to enable 4G LTE

Hi,

I spoke to my service provider and they enabled 4G on my account.
I then went into their shop and got a new SIM card, as my old one was 3G only.

So now I have 4G on my account, and a 4G compatible SIM card.


When I go into settings, all I get is the option for 2G/3G auto, and 3G only. No option for 4G/LTE.

I can type in *#*#4636#*#* and get into settings and enable LTE, and then I get the LTE icon at the top and I can go online. However, when I go back into Mobile Data settings, as soon as the screen opens, my internet drops and it reverts to "H" or "3G" at the top. Once again, when I click the option, it only display 2G/3G or 3G only.

How can I activate the option in my OS so it shows up here?


I am running Android Revolution (ARHD) version 92.

Thanks.