hereBut there are concerns that fraudsters may try to use the scheme to trick people into handing over cash for tests.The genuine service however, will never ask for payments, or ask for bank details, passwords or pin numbers.Local authorities in Greater Manchester have been advising people to be aware, and never share personal details over the phone if there is any doubt about who you are speaking to.Guidance has been issued by the NHS setting out what genuine contact tracers will do, and what they won't.They will never:Anyone with Covid-like symptoms will be asked to self-isolate as previously and to order a test through the NHS website, or by calling 119.If they test positive, they will be told to continue their week's self-isolation and.