Gina lost her phone and has to get a new number. however, whenever she tries to give out her new number to friends, she gets mixed up because her old number keeps coming to mind. what memory phenomena is gina experiencing

The memory phenomena Gina is experiencing is Proactive interference.  This happens when old information hampers the recall of newer information. An example would be, when trying to recall a new phone number, the old phone number keeps popping up in your mind, to the point when it is very difficult to remember the new number.

Okay this will take 1 hour okay dont forget me.