There was no question that AT&T, T-Mobile and Verizon gave up on their Softcard mobile payment service when they agreed to pre-install Google Wallet, but it's now apparent that they're beating an especially hasty retreat. Softcard is telling users that its service will stop working after March 31st -- when April rolls around, both the app and your account go bye-bye. It's doubtful that you'll shed a tear for an offering that was mostly meant to stifle competition, but you will have to choose another tap-to-pay service fairly quickly if you happen to be one of the remaining customers. Thankfully, there won't be a shortage of alternatives any time soon.