Is Locus available for Iphone...and will it work without cell phone service?
No/yes, see here: http://help.locusmap.eu/topic/sean-mortaz
Locus works exceptionally well offline, on Android only.
This is an app worth getting an Android phone for. You can keep your iPhone as your "phone" if you want, buy a cheap Android, and never put a SIM in it.
Thank you for your questions.
We are sorry, Locus app is developed for Android only http://docs.locusmap.eu/doku.php?id=manual:faq:locus_for_ios
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