Hi Kotelo,
concerning accommodation it is my understanding that the School is going to disclose details in a few weeks, which also include support to find proper and convenient housing. In the meantime, since I already have a good practical knowledge of the area, I have been doing some research online to find suitable housing options. If you want, I can provide you with website and search engines that allow you to have a look at available accommodation - send me a PM if you're interested
About mobile phones I would say that Italy is quite cheap when compared to other EU countries, but you should be more specific about the information you want: do you already own a mobile phone that properly works in Italy? Do you want to buy a new phone? Do you need a data plan? Etc... Just for the record, for an entry level plan you can expect to spend around 10-20 EUR/mo.