Bijoy,
He is using TEMS pocket, not T.I.
The limitations in Net Monitor, Tems investigation or Tems Pocket are probably different from each others and in my opinion, that’s where the cause of his problem is. I’m not doubting what you have seen at all.
(note: I clearly remember that TI 5 or 6 was limited to -40dBm (or perhaps -35dBm), but certainly the limitation is now gone with the newer releases. Or it’s just my memory that got fried by too much GSM exposure)