Hi IronMan, the 4G/LTE mod works quite well. You will need to buy a compatible USB modem and add it to your mobile account. The setup is straight forward and doesn't take long. I bought a Huawei modem on Amazon for about $55 and it costs me $20 a month to add it to my TMobile account for unlimited 4G coverage.
One thing to note, this mod works well in 4G rich environments. It does not work well when you don't have a lot of bars, or if you are in 3G areas.
With that being said, I've flown my BB2 way out and never lost data or video in a 4G rich environment.
I went a step beyond that and after some reading was able to broadcast live video and data, with audio from my drone/iPhone. I sent a link to family and friends around the country and in other parts of the world and they were able to see the live feed. They could even text me and I could answer.
Let me know if you need more details.
Cheesenacho