I searched for a cheap, but trustable option for a short term sim card in Korea. Everybody who I asked suggested me CHINGU MOBILE, so I gave it a try. The customer service online is really fast and they explained to me everything. I bought a 4 month package and never regrated it. Fast internet, no problems with connection and I even extended for 30 more days. The process took in total about 15 minutes. Super fast service and friendly communication. I would recommend for everyone in search for a fast and easy solution!