Like a stray signal on a crowded frequency, that unknown number keeps pinging your phone with vague greetings. The lack of a clear identity or purpose suggests a low‑effort outreach, often a test to see if the line is active. Since no response was given and the sender fell silent, it’s safest to block the number and avoid any further interaction. If you receive follow‑up messages, treat them as potential spam and report them to your carrier. Keep a record of such numbers, especially if they start requesting personal details or money, and consider using a call‑filtering app for extra protection.
A text arrived from this number less than a week ago saying “hi there” or something similar; I responded with “who r u?” but received no reply, possibly a mistake.