I think I know the answer here but could an expert please confirm for me that an unlocked Lumia 620 will NOT get 4G on US Tmobile?
If i understand correctly, requirement is both
1) WCDMA Band IV (1700)
2) WCDMA Band I (2100)
Looks like the 620 does not have (1)
http://www.nokia.com/global/products/phone/lumia620/specifications/