Budget roundup: the latest low-cost iPhones and Android phones

Photo by Asa Mathat / Recode Even if you're trying to keep costs down, you'll probably want to replace your old phone eventually. Whether it's because the battery is no longer keeping a decent charge or because the operating system is no longer being updated, smartphones usually start losing their usefulness around their third year (or sometimes earlier). The best way you can figure out your next phone is to check out the reviews and use them to decide what features are most important to you, an...