[Davidoff]

Are you using a class 10 SD card? in my car it was between the 15 and 25 minutes

Carpediem, you right, it is a class 6 but @30mb/s, 16GB, strange...
I have another one class 10 always @30mb/s, 32GB. I am obliged now to use this one for the maps.

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Hello Davidoff,

Did you try with rSAP application ? i don't know if the rSAP is natively supported with S3. I have S4 Mini and the rSAP apllication (Bluetooth SIM access profile) works but big problem you have to root your device !!

Now I put a data sim for data traffic only and my phone is only connected by bluetooth (not rsap). The new FW permit to use SIM+phone simultaneously.

Walawa, wait a minute, you mean to use 2 SIMs, only data inside the slot and the normal one with Bluetooth in handsfree mode. The new functionality is very nice, yes.

So you tell me that rSAP ("Car phone" in my picture) doesn't not work natively. My S3 is already rooted. However what a shame by Google...
The app you mean is the one that cost 9€ in PlayStore? Months ago, I already tried the trial and it didn't work. I will try again...