may i know who is this meaning in telugu

The phrase "May I know who is this?" in Telugu can be translated as: "దయచేసి చెప్పగలరా ఇది ఎవరు?"
(Dayachesi cheppagalara idi evaru?) Or more politely/formally:
"మీరెవరు అని తెలియజేయగలరా?"
(Meerevaru ani teliyajeyagalara?) If you want a simpler, casual version:
"ఇది ఎవరు?"
(Idi evaru?) Let me know if you want the translation in a different tone or context!