General Messaging problem

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http://androidforums.com – Hi guys would really appreciate if any of you could help me. My new samsung galaxy s3 has been having a strange problem and im not sure whether it is the phone or the sim card. randomly around once a day the phone will not send text messages and will not call (or phone sort of lags before it starts to call). Turning off WiFi does not force the phone to connect to the 3G. I have noticed the reception sometimes fluctuates from 0 bars to 4 bars, but when this happens its usually on 2-3 bars. I have never had this problem when i was using my iphone 4, or the previous galaxy s3 that this rep (General)