Follow ZDNET:  Add us as a preferred source  on Google. Memorial Day weekend is officially here. As you're enjoying the long weekend, I'd like to remind you that it's also an excellent time to shop for a new smartphone. Multiple retailers have rolled out major discounts on popular models, making these few days one of the best times of the year to upgrade. Whether you're looking for a cutting-edge foldable or a refurbished iPhone, there's something out there for everyone. Also: The best phones to buy in 2025 At ZDNET, we review every major smartphone release and track mobile device deals year-around. Buying a new phone in 2026 is trickier than ever before. Not only because of the current economic factors, but also because there are so many strong options available at every point. To help narrow things down, I have sorted through the many Memorial Day sales to highlight the best smartphone deals most worth your attention.…