Would it be inconvenient in China without mobile payments? How much cash should I bring?
Mobile payments are indeed mainstream, but in recent years, many channels for linking overseas cards have already been opened. Recommendation: complete the linking before departure and try a small transaction abroad, so you don’t find out upon arrival that it can't be linked (the most common reason for failure is not receiving the verification SMS). At the same time, prepare a credit card usable overseas and a small amount of cash—small snack stalls, remote scenic areas, and towns still mainly use cash. You don’t need much cash; just exchange enough for transportation upon arrival, and refill in the city.
Mobile payments are indeed mainstream, but in recent years, many channels for linking overseas cards have already been opened. Advice: Complete the linkage before departure and try a small transaction abroad, so you don’t find out upon arrival that you can’t link it (the most common reason for failure is not receiving the verification SMS). Also, prepare an overseas-usable credit card and a small amount of cash — street food vendors, remote scenic spots, and towns still primarily use cash. You don’t need much cash; just exchange enough for transportation upon arrival, and refill in the city.