Bordeaux is not a city with a high crime rate. If you respect some simple rules, you shouldn't have any problems.
Beware of pickpockets, mostly in crowded buses and in the pedestrian streets. Do not leave any luggage out of view as it might disappear. If you're taking the bus with a backpack, it's better putting it between your feet than keeping it on your back.
Do not go to clubs or bars alone at night. If you are meeting with friends, meet outside the bar/club. It's easier to get inside when you're a pack.
As another general rule, do not accept drinks offered by people you don't know, as some people may drug you and abuse you afterwards. There were several cases reported in Bordeaux. Take drinks directly at the bar or from the waiter.
contact
Bordeaux is covered by the three major telecommunication operators in France : France Telecom Orange, Bouygues, and SFR. If you have a GSM cellphone with an international subscription, you should be able to give calls from anywhere in the city. It is also possible to find phone cabins, but some have been removed recently due to their decreased usage.
As for internet access, there are a few cybercafes in the pedestrian center, which are not expensive from 2 to 4 euros per hour.
Most restaurants also offer free Wi-Fi.