I had a Samsung Galaxy S3 phone. It was DOA a few months into ownership (6-9 months) - The screen was cracked 2 to 3 months in (what a pathetic phone) but the phone was working for at least another 3 to 6 months. I took it back to MTN after the DOA (I know there was nothing they could do about the screen) and they wouldn't swap it out or honour the warranty. Beyond economical repair was the reason cited. I finished up my contract and will never have a contract with them ever again. I am currently on pay as you go with afrihost APN. the only reason I'm still on MTN is because of Afrihost, until I find the time to do some research and find a similar cost alternative on Vodacom. But never again with the worst network in SA - MTN.