Do you need to open any functions for international roaming of mobile phones? What kind of network does Germany use?

"International roaming" means that mobile phone users can continue to use their mobile phones for voice, SMS and Internet communication in other networks in other countries and regions after leaving their home networks. At present, China Telecom has opened CDMA and GSM international roaming services with operators in more than 200 countries and regions around the world, and the roaming access range is still expanding. In these countries and regions, you can continue to use CDMA or GSM mobile phones for communication. During the roaming visit, China Telecom's global service hotline18918910000 provides 7×24 hours of free labor service. Opening mode: Post-paid mobile customers only need to meet any conditions (1, bank receiving customers; Postpaid mobile customers who have been online for more than 3 months and currently have no arrears; 3 diamond, gold and silver customers; 4 green single customers) can use the handheld business hall, Huan go website, SMS business hall, account manager, business hall and no international roaming function. 10000. If roaming to Germany, use GSM network; If roaming to Germany, use the local GSM network to dial 0.99 yuan/minute; Answer 0.99 yuan/minute; Call Chinese mainland (excluding Hong Kong, Macao and Taiwan) 1.99 yuan/min, and use ** 133 to call Chinese mainland (excluding Hong Kong, Macao and Taiwan) for 0.99 yuan/min; Call other countries or regions to 3 yuan/min; Send text messages to Chinese mainland (excluding Hong Kong, Macao and Taiwan) at 0.39 yuan/article, and send text messages to other countries or regions 1.29 yuan/article, and receive them free of charge. Internet access fee is 3 yuan /3MB. For more service benefits, click on "official website" customer service 220 below to answer your questions.