I believe you are talking about Nomophobia?
I don't know other details but this is what I heard and I am sharing with you and everyone else.
Nomophobia is about losing your cellphone. For most, it is easy enough to get another and move on, but for others, losing their phone or not having reception truly is a reason for panic.
Nomophobia is a relatively new phenomena with a study in the UK concluding that 53 percent of cell phone users will suffer from nomophobia. Some people can get by their phobias easily, like with fear of rats, but for those who fear being disconnected more than anything, it could be time to seek professional help.
I hope this answer is helpful to you.:)