Hi https://mailto:O@,2,



Just some complaining about mobile phone connection everywhere in Berlin.



Signal reception is so bad even though 3G logo on the phone, the internet is not fully working. 



When I can see LTE logo on the top of my phone, It seems to be ok.



But when it turns to 3G, too slow or no internet connection even though I have a lot of data left.



And How come voice calling is so bad, it is better to use internet calling such as facebook or whatapp.



Please make your service better.



Thank you.