通つう信しん圏けん外がい

noun

out of communication range; outside the service area

Used for mobile phones, radios, and other wireless devices when they cannot connect to a network.

• 山やまの中なかでは通つう信しん圏けん外がいになることが多おおい。

  In the mountains, you are often out of communication range.

• 通つう信しん圏けん外がいのため、電でん話わがつながらなかった。

  The call didn't go through because I was outside the service area.