HTC Era 42 and BlackBerry Armstrong for T-Mobile Emerge Online

Mobile phone carrier T-Mobile USA is reportedly getting ready to add a new set of appealing devices to its lineup before the end of the year.

Among these handsets, we should see a new HTC smartphone that features the codename of Era 42, and which is expected to sport 4G capabilities inside.

Rumor has it that this could be a successor for the T-Mobile G1, which was spotted with the codename of Era G1.

Additionally, the wireless carrier should launch a BlackBerry Armstrong handset from Research In Motion, but it appears that this won’t be a high-end device.

In fact, it is said to be the low-end BlackBerry Curve 9320, somehow identical with the Curve 9310 for Verizon. Both devices should arrive on shelves in September, a leaked document that emerged over at TmoNews says.