Nokia 8270 - Manual (Page 121)

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My call
does not go
through.
Your phone may be turned
off. Verify that your phone is on.
You may be outside your
service area. No Service
appears on the screen. Verify that you are in your
service area.
You may have call
restrictions set on that
phone number. Verify that the number does
not have any restrictions on
it. See “Restrict calls” on
page 60.
Your phone may be locked. Refer to “Protect your phone
with phone lock” on page 57.
You may need to dial a ’1’
and/or an area code with
the number. Call your wireless service
provider for dialing rules.