@Bert Not at all.
Google interrogates where you are (probably from an IP ) and then serves up the site and results based on that.
Certainly, a .com TLD is preferable to anyother even if you can’t get precisely the domain name you want.
For an app, I would go with getappname.com if it was available over appname.mobi
To me, a .mobi site is a mobile optimsed mobile site, not my first port of call for the MAIN site.