"Speed dial" refers to a feature on phones or devices that allows you to quickly and easily call a specific person by just pressing a button or a few buttons, without having to manually dial their full phone number each time.
There can be statutory or case law exceptions to this kind of assignment, so keep your employment lawyer on speed dial for questions. (inc.com)
They all have their ministers on speed dial for these «tough» questions... I just wonder which one will get an answer first and respond the quickest. (religion.blogs.cnn.com)
Speed dial buttons on phones are perfect for young children doing this. (mediate.com)