i have a couple of XBee 3G global cellular devices trying to use them in Sweden.
i have tried a number of carriers; most of which exclusively use the band 1 (2100Mhz) frequency; (Telia, Telenor) - however, the only SIM card that works is one that uses band 1 (2100Mhz) and band 8 (900Mhz). i've nailed it down to the fact that 2100Mhz frequency is not working on my Xbee 3G cellular devices. i have also been able to use an Australian sim card (Optus, 900/2100Mhz) while in Sweden - and it does receive a RSSI signal.
i've contacted digi support via email - but have yet to get any information back yet so I am reaching out to the forum.