In Germany, you'll roam with O2 Germany. In fact from around 2016, it became impossible to select any other network [with an O2 UK SIM inserted], although I've not been over since 2020 to see if anything has changed.This is a long shot but does anyone know who the roaming partners are for O2 UK in the EU including Ireland please? I know there is O2 Germany so would think that a O2 UK user would be using O2 Germany but I just thought I ask if anyone knows?
Must be a while ago when you saw T-Mobile in Munich. (The T-Mobile brand was retired in Germany in 2010.) Since 2016, was unable to connect to Telekom.de network with an O2 SIM - shame, as Telekom had better coverage.I can only speak from my personal experience, my previous company phone was O2.
In Sweden, it's Telia.
In Spain, Movistar
In Germany, O2 Germany ( although I've seen T-Mobile too in Munich!)
In Netherlands, KPN.
In France, Orange.
Sorry I haven't ever been to Ireland so I don't know.
I used to connect to Telekom with Three, they used to partner with E Plus but they were awful - with Telekom I get decent EE like coverage even in the U Bahn's tunnels of Hamburg and Berlin deep underground!Must be a while ago when you saw T-Mobile in Munich. (The T-Mobile brand was retired in Germany in 2010.) Since 2016, was unable to connect to Telekom.de network with an O2 SIM - shame, as Telekom had better coverage.
Both networks were poor in comparison with the so-called "D" Networks*I used to connect to Telekom with Three, they used to partner with E Plus but they were awful - with Telekom I get decent EE like coverage even in the U Bahn's tunnels of Hamburg and Berlin deep underground!
Don't think I've ever used O2 in Germany so no idea if they're better after taking over E Plus?