I have asked elsewhere and got good advice, but being carful before I buy, 

My question is, I have a TomTom Rider and would like all the features of the rider to be available such as phone, music etc to work and to also have my iPhone connected to both the headset and the Rider, I have a 10r which gives me multipoint connections but it doesn't work as I want it to, TomTom say I need multi channel for it to allow all features to work, I have been advised by a retailer that the SF4 would do what I need but as I say I am very carful to not purchase the wrong unit.

thank you in advance for your help and comments.