According to MB UK, if the car was registered after 1/4/08 Mobilo is a "long term mobility package" which covers the cost of labour and small parts if the repair can't be undertaken by the road side, as well as breakdown, hotel etc. If the car is older than April 08. Mobilo is just a breakdown service basically.
http://www2.mercedes-benz.co.uk/con...es-Benz_Mobilo/What_services_are_offered.html
Spot on !