Your Phone can truly do anything in China
Everything in China is truly digital. Everything. It's a cashless society (most people don't carry cash/coins/credit cards) but rather pay with popular mobile Apps. Public bicycles/ebikes? Food delivery? Paying for the subway? Entering your building? Maid service? Movie tickets? Groceries delivered to your home? There is an App at identical prices as going to the store. We cannot stress enough how convenient life is in China.
But don't take our word on it, check out these external sources about cost of living and expats discussing their lives in China