tl;dr If you’d like to record a phone call, three-way call 888.909.1024 or +44 203 389 52 12 into the conversation and you’ll get a text with the recording when you hang up.

About this time last year, Ryan Block’s “Comcast Call from Hell” made the social network rounds. It was an infuriating eight minute clip of him trying to cancel his service but getting stonewalled by the customer service rep repeatedly asking questions like, “Why is it that you aren’t wanting to have the number one Internet service available?”

Fortunately, Ryan recorded the phone call for, let’s say, “quality assurance purposes.” When it went viral, Comcast stepped in, apologized and made things right.

But what if he hadn’t had that recording?

Next time you find yourself in Ryan’s shoes, ask the rep to hold for a few seconds and three-way call 888.909.1024 (or+44 203 389 52 12 in the UK) into the conversation (and for the sake of staying on the right side of wiretapping laws, tell them that they’re being recorded). When you hang up, you’ll get a text with a link to the recording.

This hack lets you record a call on any iPhone or Android device without installing an app, and it was built using only thirty lines of Ruby: