[ubuntu] ZTE MF626 mobile broadband working, but 2G only

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http://ubuntuforums.org – I've got a mobile broadband USB pen (ZTE MF627). Following the instructions on this forum, the modem is recognized and I can get a connection on networkmanager. However, it is awfully slow. I believe it is working on 2G rather than 3G (there's a blinking green led instead of the blue one I get on windows). Is there a way to toggle between 2G and 3G? Thanks in advance. (HowTos)