I have an experience to share with you guys. Once I was in a remote place, my signal in my phone got jammed, i thought the problem would be with my service provider. After coming back home i gave black and blues to my customer care highlighting my issue. They pleaded me saying that the problem is not with them. Then i browsed through the search engine regarding my issue, i got a remedy for my cell phone, there i came to know the problem called signal jamming that is experienced in most cell phones. They have a product called cell phone jammer could be very useful to get rid of these problems. Check out the details here cell phone jammer and hope this information would be beneficial. Hope that u would pass this information to all your friends, so that they too would benefited, Stay safe, Cheers