A phone number is not necessary at all and a lot depends on the industry.
Recently, the address of the site is more and more often used instead.
Modern business card puts on minimalism and simplicity - what my opinion makes a much better better impression than the old type of business cards.
Otherwise, they will not make a good impression on customers coming to the photocopier and they will just quickly fade.
Meanwhile, the use of colored inks often saves important tables or the most important statements appearing in books.
Therefore, all people who make color prints want to use multi-colored inks that perfectly reproduce the color of the document to be printed.This is of course very important, but it is equally important to reach for suitable printer paper before making color prints.
This is because printer accessories of this kind are always produced according to generally accepted standards.On the other hand, finding cheaper inks is very cost-effective for individuals and for owners of large photocopying and printing facilities where a large number of different types of printouts are made daily.