I believe you can disable it by using the iOS extension in the Tealium utag.js profile you're calling in. There options in there to specify which things you want to autotrack, and you should be able to toggle them all off if you want.
If you want to disable it completely, I believe there is also a compact version of our iOS library available that has no autotracking at all. If you don't already have access to it, please contact your account manager to find out more.
Yes, Son is correct. If you are not using the auto-tracking feature at all we do have a compact library that will have a smaller footprint and use less overhead. As Son pointed out, contact your account manager and they can put you in touch with the mobile team to obtain the compact version of the library.