So I bought a used Samsung GS2 from a known supplier for PhP17,000 or 405USD. I wasn't minding the emergency calls only message at the lock screen at first because Globe Telecom SIM usually go to Emergency Mode even in my old phone. It starts annoying me because I can't call or text anyone! Things that I did: 1.) Tested the SIM on my old phone to check if it is working - it is. 2.) Tried my brother's SIM on mine, suddenly, it worked! 3.) I put back my SIM again and it is still working. 4.) After a while, I got the emergency calls only again. Tried turning on and off the phone itself. - nope. nothing happened. 5.) Bought a new prepaid SIM of the same carrier(Globe Telecom). - it worked for just the 1st 12hrs. Then I got stuck at emergency calls only again. The seller told me it still has Samsung Warranty but I don't know how to check if how long my warranty still is. If anyone would tell me how to get/know my warranty time remaining, I will try to give Samsung the call to address this problem and try to ask if I can give it to them to take a look or get a replacement unit. Thanks in Advance guys. Sorry if my English is also not that perfect since it is not my native language. BTW I'm from the Philippines.