I don't think anyone has made an AC-coupled phone charger in decades since it's way more bulky and expensive. There might be some consumer electronics that uses a transformer to get a low-voltage AC output, but I can't think of any offhand.
Switching supplies should work from DC, but I don't want to give any guarantees. In particular, for a higher-power supply with power factor correction, I'm not sure what it does if the input isn't AC.
Switching supplies should work from DC, but I don't want to give any guarantees. In particular, for a higher-power supply with power factor correction, I'm not sure what it does if the input isn't AC.