Nokia’s well-received Lumia 800 Windows Phone might be graced with a 4G upgrade ahead of a potential launch in the US on AT&T and Verizon.

CNET reports that the rejuvenated Finnish smartphone giant is in talks with the major carriers, but both are insisting that the device is 4G compatible.

Nokia is now testing a 4G version of the Lumia 800, alongside Verizon and AT&T, according to the reports.

The only caveat to the plan is that Microsoft’s Windows Phone operating system does not yet support next generation LTE mobile internet speeds.