Administration pages which do not have their own special header search form should use cat-search.inc.
Not sure what you mean by "SMS cellular providers page"? I might have missed something obvious here...
(In reply to Magnus Enger from comment #1)
> Not sure what you mean by "SMS cellular providers page"? I might have missed
> something obvious here...
A feature added by Bug 9021. You have to set the value of SMSSendDriver system preference to 'Email' to make the page appear in Administration.
*** This bug has been marked as a duplicate of bug 15936 ***
*** Bug 15942 has been marked as a duplicate of this bug. ***