Hello how may I help you? I have a concern What is your concern? I'd be happy to help with it! I have been receiving call from an unknown number You should be cautious when dealing with unknown phone callers. They could be attempting to steal your personal information. There are text messages as well containing image attachment You shouldn't open attachments from unknown numbers. It's very unsafe. The number is from a trusted friend of mine You should ask him if he is sending you these messages. If he isn't I would just delete them. Okay will do. Thanks No problem.