Contact
Wireless Trondheim
(http://tradlosetrondheim....) is a wireless network covering most of the city centre. 3h=nok 10, 24h=nok 29.
Railway Station
The Railway Station has an electronic information kiosk about the city. It has a keyboard but the web browser has no address bar, so you can only click on links to other sites. But find your way to Google it's possible, be creative, and you can type in the address of the website you want to visit into Google Search.
Generally considered to be the sort of city where little old ladies can walk safely in dark alleys.It is also not terribly uncommon that regular people will go to great strides to give you back your wallet if you drop it, with cash and credit cards intact.
The only "danger" you might encounter are the occasional youths stumbling around in large groups on Friday/Saturdays. The same goes for Trondheim as anywhere else; leave drunk people alone and it's a good chance they'll leave you alone as well.
There are some beggars and rough people. Norway has an extensive social wellfare system, and everyone is guaranteed a place to live and a minimum hand out from the government for single person aprox 5000 NOK a month. Beggars are therefore usually people whose economical difficulties are related to excessive use of drugs or alcohol. In the summer, you might also encounter foreigners who have travelled to Norway on the purpose of begging for money. Begging is not illegal in Norway.