Talk:Germany/@comment-87.252.176.132-20180423191620/@comment-24682153-20180423211324

Yes. This is possible. No need to connect to the German home network first. But be aware of many IFs. You can buy a German SIM still un-activated on eBay and other places. This can be activated through OnlineID or WebID. You need a cam, stable WiFi and your passport/ ID card. Telekom is very picky about this address, the other providers are fine with any (prepare a fake but real address). Some nationalities of smaller overseas countries can't be activated online, check before if your country is elegible (if you come from out of Europe). Coming back to your question, you will be connected to the roaming network without having connected first to the German network. Roaming for Vodafone.de and its resellers will be mostly restricted to other Vodafone and their partner networks, for o2.de and brands there is still no 4G/LTE roaming available, only 2G and 3G, which is likely to change soon.