Best iPhone Tracking App / Service 2012?

Hi Guys,

Reading a lot of conflicting responses on tracking an iPhone in "real-time".

We need to be able to track our phones at all times in a regular browser (office staff needs to know where the service guys are currently located).

I see Apps like Footprints™ and others... and wanted to know if anyone has some solid experience and can recommend a good app / service.

No problem paying for an app / service that works.

Thanks in advance for any advice / insight.

Also, if you have any comments on how much data this sort of tracking consumes as we have to balance that against our data plans.

that works, but times out awfully fast (I would want my assistant to just leave the window / app open on a second monitor all day) and there is no history...

any other options?