07-09-2017, 11:00
A1 is a Vodafone partner. Normally it prefers Vodafone networks in roaming. Maybe that is why they try to keep you out of Telekom and o2 in Germany. You might try to select Vodafone manually.
Tuenti claims that they do not prevent 4G in roaming. According to them it is the o2 roaming platform that does not allow their customers to use 4G in roaming. People are complaining, however it will take some time until these problems are solved.
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