Sash is irritated when Nikki demands that she compensates her for the phone in Sunday's Fair City on RTÉ One and the RTÉ Player.
On Friday, Nikki tasked Sash with selling a phone in McCoy's.
Sash then panicked when Maxine enquired about a missing phone, deducing that Nikki must have stolen it.
Sash returned the phone to Maxine, lying that a customer had turned it in.
However, Sash was then horrified to discover that the phone was not Maxine's after all!
On Sunday, Nikki orders Sash to retrieve the phone from Maxine, but Sash is unsuccessful - and Nikki wants payback!
The trailer for Sunday's episode sees Sash asking Nikki: "Are you threatening me after everything I've done for you?!"
"Just do what I say and we won't have a problem!" Nikki replies.
Fans can watch what happens next on Sunday on RTÉ One and the RTÉ Player at 8:30pm.
Fair City airs on RTÉ One and the RTÉ Player on Sundays, Tuesdays, Thursdays, and Fridays.
