Hi, i have the same problem with a nokia lumia 900, I have bought it via amazon and it is an unlocked phone from at&t RM-808, this phone has LTA support and of course HDSPA support, there is only 3G network in my country but the phone only connects to "E" or 2G network and some times appear 4G symbol and the connection goes fast, but never connects in 3G, there is no option to select the speed connection in the config menu of my phone, only data on/off and APN config, what can i do?, a phone like this without 3G connection is a junk!!!, plase i hope anybody has an answer for my questions, thanks!!
Does the field-test monitor help? Menu » Phone » Keypad » ##3282 » button Call » three dots » Settings » Network type = 3G only
You can pin that code like a phone number to your home screen.