HS I don't think I've ever seen a mini USB Android phone, at least not in recent (last 3 years) generations. Micro USB is pretty much the standard for Androids. Blackberries too. Been using a BB wall charger with my GS1 at home for the last year and a half, never an issue.
With tablets you might have a case, a lot of Android tablets use proprietary connectors, though some (like the Nexus 7) stick with micro USB.