The audience here on Hacker News has a pretty realistic idea of how quickly you can track down the location of people using a set of credit cards that are known-- not to mention two phones which were also stolen and shockingly not powered down. I am not saying that the process is infallible, but there are companies I have worked for where you could have given the known information (phones, credit cards) and they could have tracked down the location in real time with a 70-80% certainty.
Catching car jackers with a 70% certainty (or 33% even) will shut down a car jacking ring pretty quick. This sort of crime is exploding in Los Angeles this year.
That the police don't try as hard to track a person down as a mobile ad server would, makes me wonder about the incentives to curb crime.
The only solution I have found for preventing thefts from my construction sites in St. Louis is to pay a stipend to local economically disadvantaged people to live at the site, and provide firearms for the purpose of discouraging thieves. At the request of the St. Louis city police, we stopped reporting incidents of attempted theft.
The DA in my area recently stopped attending murder trials. This is what the powers that be want. When the prosecutor does not show up in court, the case cannot proceed.