[usedtolurk]

In Australia, all the mobile phone and data plans have massive penalties for exceeding your quota by even small amounts. My provider (and I suspect, all the others) deliberately obfiscates both the billing details and the plan rules to make it practically impossible to see how close to your limit your are.

To avoid crippling surprises, people to upgrade to plans they really don't need.

In the banking industry, banks are not allowed to profit from penalty fees (just recoup their losses). I think a similar approach in telecoms would be a good thing.