Isis today announced another promotion with the goal of coaxing smartphone owners into using its tap-and-go mobile payment service. The promotion will give American Express card holders who've registered their card with Isis a statement credit when they use Isis to pay for a ride in a medallioned yellow cab. Isis will credit users back for 50% of the fare up to a maximum of $100. Isis is a joint venture backed by AT&T, T-Mobile, and Verizon Wireless. About two dozen different Android devices are compatible with the system, which requires a secure SIM card, NFC, a credit card from a participating financial firm, and the Isis mobile application. It is free to sign up for Isis.


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