I had a very similar experience with the stock issues. When I was at the official Nothing store in Bangalore, a staff member told me they stopped manufacturing the Phone (3). To make it weirder, when I reached out to customer support, they avoided the question entirely and just started promoting the 4a Pro.
However, nothing hasn’t made any official announcement about discontinuing it, and it’s still very much their 2026 flagship. Online availability has just been a rollercoaster, it was missing from Amazon for a whole month before the Summer Sale when I finally grabbed one. The good news is that right now, it’s actively available on both Flipkart and Amazon, so it looks like the online side is still being restocked even if offline stores are dropping the ball.