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Precap..
Why can't she just do the checking in solitude? But then there is no surety that? the number would match Han's as she could very well be using an alternate number. Hans is intelligent that way, while I have felt whatever success Taps get is purely due to chance or Mata Rani's blessings.
This time I am sure she will be interrupted and Hans or #team will find out she is checking phone numbers and catch on. I think Hans scolding Rohit happens after this, which means Hans know Taps is suspicious about Rohit having help.
Acc to the bytes Taps sees Hans talking to Rohit too. There are so many clues to ponder on... Hans knowing Purab's phone lock, her finding Sargam so soon, her chipku attitude with Purab...
How I wish the writers present Taps being smarty intelligent too. Let her make Hans assume that she believes whatever excuses Hans makes and act naive do as to catch her red handed without any chance of escape. Just the other day I saw a clip (meet I think) where she exposes such a fake arm injury by throwing something at her which the lady catches on impulse. Give us some such intelligent moves from Taps, rather than everything happening by chance.