No calls when media player ,...help

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hey guys

hmm phone is fine

just batteryh life is not that great

but i have a prob

i love to stream radio on the tmobile gprs network

or watch trailers

everytime i do sumthin like dat

i never get a call , my phone never rings

i missed soo many calls without realizing it

i tested it.. by streaming a radio station on my mediaplayer

and then called myself multiple times

IT TOOOK really long to find my phone ( felt like i was calling someone outta range, or in roaming ) and right befor it gets to my fone, it switches to my voicemail... no ring, nuthin ,, doesnt even reach it..

i stoped media player.. called again.. PERFECT call

no time.. no waitng and fone rang

so this is weird

im going to have to return it if i cant fixt it

I thought initially some apps i was runnin might cause it

but i closed eveyrthing .. first and then started media player..

i also did a Hard Reset just in cas e

and still the same thing

can i change it.. i bought it on ebay.. and 14 days are over.. so cant return it

its unlocked to tmobile .. can i just ask att for a new one.. altough im not suscribed to them