http://www.gsmarena.com/apple_iphone_5-4910.php
LEBANON
2G capabilities GSM 900, GSM 1800
3G capabilities UMTS 900, 2100
4G capabilities LTE 1800
So yes the 1428 does not run LTE 1800, which is for lebanon
no there is no fix for it
and dont worry we still dont have 4G for our mobiles, it is only for Dongles routers and tablets
by that time we might have changed to iphone 5s or 6 or the one after that