ipad / iphone

The only linking that can be done would be connecting them both to the same iCloud account, if the 4s will support that. You would be able to share contacts, calendars, reminders and notes as well as email.

Markie K wrote:

how do you link an ipad mini 2 to a 4s iphone?

If you were thinking of iOS continuity, you need at least an iPhone 5 for that feature

System requirements for Continuity on iPhone, iPad, iPod touch, and Mac - Apple Support