Hi Nat,
There used to be software sold by NeoCall (
Neocall, Spyphone, Cryptophone, Software spia per cellulari) that enabled you to transfer the data via bluetooth. The way it worked was that the data was collected and stayed on the target phone until you had a chance to transfer the data over to your own phone. This would then not require any use of a 3rd party server.
Unfortunately, I cant access their site to see if its still for sale. Been having problems with their site all day.
SPG