Twitter Phone Followers?

[h_e_a_r_tfelt]

Hi,
My Twitter is @NENGLISHN and I tweet an English word daily. I have lots of phone followers. But they complain getting "Discover Tweet" after every four days. How can I disable It? There are only some twitter accounts having the same problem that their phone followers who are not even twitter users receiving "Discover Tweet".

I'll be very grateful to you for your help.

[Frances]

All followers get that
Even when it's not on the phone
I've been on twitter for a while, and it keeps sending me emails; it's just a part of twitter