What should I ask an ISP before signing up?

The answer

Ask which connection type will be installed at your exact address, the itemised one-time and recurring charges including taxes, the data threshold and the speed after it, any lock-in and early exit terms, the rate after an introductory period, who owns the equipment and what happens to it when you leave, and how faults are reported and how quickly they are usually handled. Get every answer in writing, and keep it with your receipts.