Can domestic mobile phones be used in Germany?

You can use it, but you need to enable the international roaming function.

Gansu Mobile opens international roaming: within 60 days of opening: the network age is less than 6 months, the phone bill balance is greater than that of 300 yuan, and the network age is more than 6 months, and the phone bill balance is greater than that of 200 yuan; Long-term validity of opening: it can be opened if the phone bill balance is greater than that of 500 yuan.

If the phone bill balance is sufficient, you can follow and bind Gansu Mobile's official WeChat account "China Mobile 10086" on WeChat. After logging in, click the menu I want to handle-handle business-international business in turn, and select international and Hong Kong, Macao and Taiwan roaming/international and Hong Kong, Macao and Taiwan long-distance as needed to view roaming international and tariffs and long-distance fees, and open them as needed.

When roaming in Germany, call Chinese mainland, and when answering at roaming place, the charge is 1.99 yuan/min, call roaming place at 0.99 yuan/min, call other countries and regions in 3 yuan (excluding specific countries and regions), send text messages back to the mainland at 0.39 yuan/piece, and send text messages to other countries and regions 1.29 yuan/piece.