What mobile phone card should I buy to travel to Germany?

If you don't go to Germany for a long time, it is not recommended to buy a Sim card. Sim cards in Germany are registered and need to be purchased with passports. The card itself generally costs ten euros, and it is not cheap to call or send a text message back to China. It is suggested to open domestic GSM service before traveling.

The international area code for Germany is 49. Call from China to Germany: 00+49 (Germany)+area code (don't dial the previous number 0)+phone number. For example, to call Berlin from China, please dial 00-49-30- 123456.

To make long distance calls across regions in Germany: 0+ area code+telephone number. If you call Berlin, dial 0 30+ phone number; If you are calling from the same area, just dial this number directly.

Call back to China from German: 00+86+ area code+phone number.