GE 27939 User Manual page 34

Number of digits
Eleven digits
Ten digits
Seven digits
NOTE: If the phone company does not supply all ten digits of an incoming
caller's number, you will not be allowed to adjust the format of that number.
Scroll to the number you want to call back:
3. If using the base or handset: press the CID review (up or down arrow)
button.
4. If the number will not dial as shown, press the format button. Repeat if
necessary, until the correct number of digits are shown.
5. Press the TALK/callback button on handset or SPEAKER button on base.
The number dials automatically.
NOTES: If you find it necessary to dial all local calls with the area codes included
press and hold flash/program until SET AREA CODE appears, then enter "000."
If the number is corrupted, such as a number in a name or an alphabetical
character in a number, an error tone comes from the handset and the number
won't dial.
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Explanation
long distance code "1"
+ 3-digit area code
+ 7-digit telephone number.
3-digit area code +
7-digit telephone number.
7-digit telephone number.
Example
1-317-888-8888
317-888-8888
888-8888