How to setup call forwarding from external number to iPlum number while travelling?

You can forward your mobile or landline voice calls to iPlum number by following instructions on your vendor website.

Below are examples of some U.S landline and mobile carriers.  These instructions would vary for other carriers:

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AT&T Mobile
To turn ON Call Forwarding:
On your phone dialer enter **21*, then the 10-digit iPlum number you wish to forward your calls, followed by #. Push the Call icon. Your wireless device displays a confirmation message when Call Forwarding activates. Example: **21*408 123 1234# (no spaces)
To turn OFF Call Forwarding:
On your phone dialer enter #21# & Press the Call  key. Your wireless device displays a confirmation message when call forwarding deactivates

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AT&T Landline
To turn ON Call Forwarding:
Dial *72# and listen for dial tone.
Enter the number where you wish to forward calls.: 1 + Your iPlum Number  (Example 12011231234)
Wait for the confirmation tone. After the confirmation tone, the system will automatically place a call to the number to which calls will be forwarded.
If the forward-to party answers the call, the feature is activated.
To turn OFF CF: *73#‍

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Verizon Mobile
To turn ON Call Forwarding:
On your phone dialer enter *72, then the 10-digit iPlum number you wish to forward your calls. Push the Call icon. You should hear a confirmation tone or message when Call Forwarding activates. Example: *72 408 123 1234 (no spaces)
To turn OFF Call Forwarding:
On your phone dialer enter *73 & Press the Call  key. You should hear a confirmation tone or message when call forwarding deactivates‍

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T-mobile, Sprint or other mobile & landline carriers have similar instructions.  Please check with your provider for setting call forwarding.