Was disappointed to know that my phone Lumia 1020 supports just 1 LTE band(Band 3-1800) even though it costed a bomb.
Was searching to find if these band compatibility is h/w or s/w issue and stumbled upon this article.
Might be useful if u own a rooted high end phone which does not support all bands.
1. A phone with a Qualcomm processor, that is rooted.
2. (For now) Install a custom ROM & kernel to get rid of the anti-tamper code
3. Edit six values in your phone’s non volatile (NV) memory to enable a lot of additional frequency bands
What bands you can add varies with phone model, so check yourself.
Try at your own risk, me too trying.