Two rings, then stopped. Line was busy when I tried, on two occasions, to return the call.

Probably a spammer. I don't know why people like this exist! I will NEVER buy anything nor sign up to anything from a stranger who connects me like this! The number "goes nowhere" when I try to return the call. Time wasters at best, thieves at worst!

The phone rang twice and then stopped. A call centre robot dialer may have made the call.