New evidence suggests Samsung has started testing variants of the Galaxy Note 4, its next major phablet set to be unveiled this fall.

Shipments labeled SM-N910x were recently tracked going through an R&D facility in India. The “SM-N910” designation follows Samsung’s model numbering pattern for its Note series.
In particular, the SM-N910A appears intended for AT&T’s network. This suggests Samsung is already working on carrier-specific versions of the Note 4 ahead of its expected launch.
Rumors indicate the Note 4 will retain the same 5.7-inch screen size as the previous Note 3. Pricing on the test units matches the Note 3 as well.
Samsung traditionally unveils its new Galaxy Note lineup each year at the IFA trade show in Berlin, which takes place in early September. So the timing of these shipments lines up with preliminary testing about 3 months before the Note 4’s likely debut.
Of course, details on the Note 4’s specs and features remain scarce. But the leak of these test units confirms Samsung is hard at work on the anticipated Note sequel, fine-tuning carrier-specific models for launch later this year. Expect plenty more Note 4 rumors and leaks in the coming months leading to the big unveiling.