You can always do "Add airtime for a friend" and select that you have an airtime PIN or BUY a timecard with a credit card, whether on the web site or using the app (Android or iOS). It redeeming points for an airtime card for a phone not in the same account that used to work with the iOS app but not anymore. It's probably not a popular opinion, but I think TF is just enforcing the term that reward points cannot be shared with another account.
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