From Urban Dictionary:

No-mo-pho-bia (\,nô-mə-`fô-bç-ə\) noun : an exaggerated, inexplicable, and illogical fear being without a mobile device, power source, or service area.

Origin: Dubbed by British experts who claim that state that fifty-three percent of mobile users, with forty-eight percent women and 58 percent of men questioned in their study admitted to experience feelings of anxiety when they run out of a battery or credit, lose their phone, or have no network coverage.