Have you received an SMS from an unknown sender, and does the content look suspicious? Then it may be spam. Usually the spammer obtained your number from a database without authorization or they are sending messages to random numbers.
Tip: To prevent spam messages only give your mobile number to people you can trust.
You usually receive this kind of message from a friend or acquaintance who received the message from someone else. So every customer is a link in the chain, spreading false information. Please don't resend spam messages like these.