I don't know about whether RTTI was available on the V40 but I was glad to have the option of installing it on my XC70 to supplement the original TMC.
RTTI does use data allowance but I believe it is a very small amount of compressed data, more akin to simple SMS text messages than Apps. I don't use a smartphone so my data allowance is minimal and I have never had issues with over use whether tethered to the Volvo or my stand alone Tomtom in my other car.
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