Tracfone is not an actual carrier, which is why they’re not listed as a carrier choice in OnDeck and SwimOffice. Please visit http://preprepaid.com/whichtracfonecarrier.php to figure out which carrier the phone uses, then select the appropriate carrier from the dropdown when entering your number for SMS texting.

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See Also
Google Voice not listed in SMS carriers
Add a cell number for SMS texting
Send a text message with OnDeck