Mytouch 4g playing videos

can anyone help me figure out why videos will not play on any phone i use? I had the mytouch 3g and all videos wud constantly cut out. I upgraded to the 4g and it does the same exact thing. Cud something be wrong with sim card maybe? I don't know much about this subj so if someone out there has any ideas i wud greatly appreciate any help u cud offer.

Thank you

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It sounds like you do not have a strong data connection. What kind of videos are you trying to play? Youtube?