Support s2 dropping calls, modem or carrier?

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http://androidforums.com – so i've had this problem before it comes and goes. some say it's because i have a european modem which is not compatible with a canadian carrier, but i just want to share a few symptons the calls drop randomly. meaning it could drop at 40 min or 40 seconds calls drop on full signal. meaning i have full bars but all of a sudden no bars with a circle and a slash in between. lasts about 3 seconds before i get full bars again. does anyone else here have the international s2 on a canadian carrier, more precisely fido network, that drops calls? (General)