Hi @krissern ,
Did you try another known working SIM card in your phone?
Sometimes it doesn't pay to assume with electronics. It could be a compatibility issue between, in your case, the SIM card reader in the phone and your particular SIM card. If you have the opportunity to try another card, why not? At least you have eliminated the possibility if it doesn't work as well and you've only lost a bit of time.
Here are the frequencies for the phone (not sure if the phone specifications will be the same for every country that it is sold in).
2G bands 850 / 900 / 1800 / 1900
3G bands HSDPA 850 / 900 / 2100
HSDPA 850 / 1700(AWS) / 1900 / 2100 - USA
4G bands LTE band 1(2100), 3(1800), 5(850), 7(2600), 8(900), 20(800), 28(700)
LTE band 2(1900), 4(1700/2100), 5(850), 7(2600), 12(700), 13(700) - USA.
You need to check if your phone service provider operates their 3G service, in your area, on at least one of the (non USA) frequencies shown.
HSPDA is an upgraded version of UMTS.
Also check the APN settings in your phone are what is shown on your service provider's website. Don't know the phone but try Home > Settings > Connections > more > Mobile Networks > Access Point Names
Hopefully this is of some help.