I want to leave BT infinity. Everytime I use a rival standard broadband line checker it says I have an un recognised product on the line. Eg below from Tesco Broadband. "We're sorry, we have detected that you have an incompatible product on your line. You may have a product installed on your line, such as an alarm service, which cannot be supported with Tesco Broadband." I have tried removing the front part of the open reach plate from the wall but this did no good. Any ideas on how to proceed?