TrueCall Unit Filter and Reject Nuisance Phone Calls. TrueCall stops nuisance phone calls like telemarketing, silent, overseas call centres, fax, robocalls, market researchers and offensive or threatening calls, but lets your family and friends straight through.

• When you receive a telephone call at home, trueCall immediately checks the caller's number

• If it recognises them as a friend or a member of your family, trueCall lets them through as normal

• If the caller's number is on your personal Zap list - a list of numbers of telemarketers or other nuisance callers - trueCall answers the call itself, and politely tells the caller that you're not interested in their call - your phone never rings

• About the size of a paperback book