Rest assured 3G roaming fees are outrageous in Europe, too. For longer stays abroad, it's better to buy a local (foreign country) SIM card and insert it into your 3G/LTE iPad. That's why I keep the SIM-card slot of my iPad empty when I'm at home; I use my iPhone's 3G connection on the iPad. When abroad, I can reverse the process: use the iPad's 3G connection on the iPhone.
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