Hey guys this is my first time posting here but I have trolled for years, I was wondering if anybody knows why my galaxy s3 wont pick up another carriers sim card? It was running on telecom for the last owner and it has all the telecom apps installed but when I put in a vodafone sim card it says "No Sim" in the notification area. Before anyone asks yes I have made sure the sim card is put in properly. I was wondering if the previous owner had somehow got this phone "blacklisted" so I rang telecom and the person I was talking to said no it isn't. I was lead to believe that telecoms s3 is not locked onto their network so I can use any sim card from any carrier I wanted but this doesn't seem to be the case?
Any advice will be greatly appreciated, I paid good money for this phone and starting to feel like I should have just kept using my galaxy ace.
Cheers
John