With 4G mobile networks in mind,

it’s easy to know if your smartphone supports the standard. On Android smartphones, Blackberry, iPhones and Windows mobile devices.

Android

For Android Users, go to settings >> Network settings >> mobile network. It should give you a dropdown menu of mobile standards such as 2G, 3G or LTE (4G). If you don’t see 4G or LTE, then your smartphone doesn’t support the standard.

iPhone

On the iPhone, go to Settings > General > cellular > Enable 4G LTE.

Windows

On Windows Phone, go to Settings > Celluar + Sim > Highest connection speed and check if LTE is part of the options.

Blackberry

Go to settings>>Network and Connection>>Mobile Network>> Network mode and you’ll see 4G&3G&2G. however, if you are using Blackberry Q5 and below, you won’t get 4G network services.
Once you’ve selected LTE and you’ve on a 4G network, the “LTE” symbol will appear on the phone status bar replacing either “3G”, “H” or “2G” symbols.

Hope it Helps???