The U.S. version of Nokia 3310 works on T-Mobile's network only
Introduced as a 2G feature phone that supports GSM networks only, HMD promised to work with carriers in the United States in order to find a solution to the issue. Unfortunately for Nokia fans, EDGE coverage on GSM networks is a bit of a problem in the U.S.
The TA-1037 is undoubtedly the U.S. version of the Nokia 3310 and, according to the FCC, it will only support GSM bands 850MHz and 1900MHz. The latter is used by T-Mobile, so the Nokia 3310 could be exclusively available through the Uncarrier.
Of course, HMD could decide to add 3G support to the Nokia 3310 and make it available via other carriers as well, but that would mean a higher price for the feature phone.
Things that are NOT allowed: