As seen on Dragons Den, TrueCall is the complete solution to all types of nuisance phone call - telemarketing, silent calls, calls from overseas call centres, fax calls, robocalls, market researchers, offensive or threatening calls, misdials, wrong numbers and recorded message calls.TrueCall is about the size of a paperback book. It plugs into your phone line at home and checks every call you receive before letting your phone ring.TrueCall checks every call you receive before letting your phone ring. It connects your friends, family and invited callers straight through but stops all sorts of nuisance calls - telemarketing, silent calls, market researchers, calls from overseas call centres, fax calls, offensive or threatening calls, misdials, wrong numbers and recorded message calls.