Can someone block my mobile phone without any kind of jamming technology or other special devices?

Hello everyone! Recently I've noticed that sometimes my cell phone looses its reception, without any reason. Occasionally it happens right after some important meetings, so I'm not able to inform my boss about the results of the meeting ASAP. First I haven't paid attention to that, because such a thing might happen. But now I see that someone must be doing it for a reason. How can they do it and how can I protect myself?

Hi there Peter!

We should tell you that thanks to the vulnerabilities of modern smartphones, it is really possible to block smartphone's ability to receive and make calls without any special equipment. There are a couple of possible ways how to achieve that. First of all you should know that someone can simply flood your smartphone with lots of unreadable SMS messages and it will loose reception, while you won't even see what's happening.

Also you should try to check whether there is a cell phone jammer nearby. To do that try go away from the place where you've lost reception for about 40 meters (130 feet), that's the size of the powerful signal blocker working range. If you still have no reception – then someone simply floods your mobile device. 

If you are running Android smartphone – think of protection, someone may have installed special application, that dials default mobile phone number and lets evildoer to listen all what's going on around the device. In that case your own mobile phone may be turned into a powerful and sensitive eavesdropping bug. In that case, check your smartphone for viruses, install an anti-virus apps and never install applications from the third parties. That will probably help you to protect your smartphone.

Thanks for your question, I hope, I've managed to help!