If you have a phone that supports LTE or 4G, you need to activate it with your mobile carrier in order to benefit from the speed. To do so, follow these instructions:
Zain
Send 4G as an SMS to 959 to enable 4G on both prepaid and billed SIM cards. Speed 4G data SIMs should work.
On iPhone: settings then general then cellular then set enable lte to on.
On iPad: settings then cellular data then set enable lte to on.
Mobily
You must go to Mobily and issue a new SIM card that supports 4G.
STC
You can “activate” LTE by sending 4466 to 902.