I would recommend one service i used till one year ago (last phone i had a problem with was an iphone 3gs that fell on the wake button and wake button didnt work anymore). But please don't blame me if not satisfied by their service....
I recommend them because of their attitude (they called me to explain what is faulty, sometimes advisng me that something could go wrong and that it would be on my own risk to go on, and sometimes even refusing to repair due to the high cost of the potential damage - so at least they didn't butcher my phone without warning they let me decide if i wanna allow them to try to fix it or not)....
It's name is "Borcan GSM" (Borcan is the name of the owner
)
Location: Piata Iancului right across the subway station (vis-a-vis de Intermacedonia, chiar pe colt, unde e ieshirea liftului de la metrou, e un amanet langa, tot al lui).
Except the problem with the iphone (and for fixing it, the flex connector band containing wake button, headset jack and so needed to be replaced) I used their services on a regular basis for more simple devices (nokia 8800 etc).. I didnt have issues with nowadays smartphones (guess I was lucky)... So i don't know how good they are on it... But I would give it a try...
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