If you want to use your phone as your EasyCard and you’re not a Samsung user (see here if you are), you can use the Easy Wallet app (Google Play) to beep in and out of the MRT and even use YouBikes! Unfortunately, the Apple version of the app doesn’t include this functionality due to the apparently ongoing tension between Apple and the EasyCard corporation about third-party apps using NFC functionality (although there are rumors this will change).
The Easycard Wallet which could previously tell you your card balance and display your receipts has had a revamp. You can now use the app to make purchases instead of fishing out your Easycard. Unfortunately, you won’t be able to register for the pay function without a Taiwanese ID until the end of May according to a Customer Service representative (ARCs do not meet the required format and no alternative is given for foreign residents to sign up.)
A customer service rep sent the following message, saying that foreign residents will be able to register for the app starting at the end of May. They’re phrasing it like it was a planned rollout as opposed to just bad programming and lack of forethought, but hey… it’s something: