TfE M-Tickets is a free iPhone app developed by Corethree Ltd. It falls under the category of Travel & Navigation, making it a useful tool for those who rely on public transportation in Edinburgh. With this app, users can conveniently purchase and use tickets directly on their iPhone, eliminating the hassle of searching for loose change.

Upon downloading the app and signing up, users can easily buy tickets within the app using a registered debit or credit card. It's worth noting that there is a minimum spend requirement of £4 for ticket purchases. However, users have the flexibility to mix and match different ticket types to meet this minimum.