I'm not sure how it works but it works but with Semble in NZ they seem to be able to do it with the phone off http://www.semble.co.nz/faqs/always-on http://www.

I'm not sure how it works but it works but with Semble in NZ they seem to be able to do it with the phone off http://www.semble.co.nz/faqs/always-on http://www.semble.co.nz/faqs/always-on