Isis, the joint venture between AT&T Mobility, T-Mobile USA and Verizon Wireless, is promoting the use of Wells Fargo credit cards in the Isis Mobile Wallet.

Until April 30, consumers using a participating Wells Fargo credit card in the Isis Mobile Wallet will receive a 20 percent rebate in their statement on all tap-an- pay purchases, up to $100 per month, as well as a $20 credit the first time they tap to pay.

American Express is running a similar offer until Feb. 28.

In December 2013, Wells Fargo became the third bank, after American Express and JPMorgan Chase, to announce support for Isis. Wells Fargo also announced a customer pilot of the Isis mobile wallet.

The 20/20 promotion is available to all Wells Fargo credit cardholders who add participating Wells Fargo credit cards into their Isis mobile wallet. The wallet can be used at merchant locations that accept contactless payments across the U.S.

The Isis mobile wallet is supported on 50 Isis-ready smartphones available through AT&T, T-Mobile and Verizon Wireless. Customers with an Isis-ready smartphone need to get an enhanced SIM card from their mobile carrier and download the Isis mobile wallet for free from Google Play. Messaging and data charges may apply, Isis warns.

Learn more about mobile/digital wallets.