Hi, thank you for your question.
I have looked in to this for you and I can confirm that you do not have to store the same 50 contacts on each handset for the BT2500 Telephone with Answer Machine - Quad. Therefore, in total you would be able to store up to 200 numbers across all four handsets. I hope this helps.
Thank you for using Argos Q&A.
3out of 3found this answer helpful.