Freethisberrydotcom is correct. So long as your carrier is sticking with the standard bands used in the rest of the world (except for TMobile in the USA and Wind Mobile in Canada), you will get 4G, a.k.a. HSDPA+. If they're installing LTE, that's a different story, but my guess is that they're just going to HSDPA+.
Part of the difficulty with the 4G specification is that it can mean so much, so you often end up needing to know what type of 4G. But hopefully the above info will help.
Posted from my CrackBerry at wapforums.crackberry.com
No you won't get 4G, only the US and Canada call HSPA+/HSDPA as 4G or H+ to burst the sales up, however the real 4G Internationally is meant for LTE
So I don't think you will see any difference.
In case they meant 4G as HSPA+/HSDPA, If you phone can run on their 3G Coverage then It will be ok, but won't show 4G/H+ because as I mentioned earlier it's something exclusive to US and Canada to bring the sales up, just names, HSPA+ always been 3G never been 4G and still any country in the world name it 3G. but if it can't connect to the 3G it won't work on 4G
I can see your phone having T-Mobile AWS Bands, which are not the international bands, don't know if Bahamas offer AWS for 3G.
But my carrier I believe is installing HSPA+ therefore giving me 4G capability correct?
Don't even call it 4G, it was a way to cheat customers in the US to buy the new devices.
HSPA+ never been 4G, it's always called 3G or under rare cases the correct name is 3.75G as it's the latest end in 3G
But let's say your carrier named it 4G, according to your BlackBerry About Screen, you would never see the word H+/4G written on screen, but may get connected to it, you may have to test the download speed it may reech up to 700KB/S
But according to your BlackBerry About screen it seams you bought the device from T-Mobile? Or your carrier in Bahamas got the same AwS 3G frequency.
In case your Carrier got AWS as T-Mobile, it will work fine on 3G and HSPA+ without showing H+/4G, if not, it would never even get 3G
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