Hi there! Nice choice of smartphone! I also have a symbian phone. You should be ok with security, if in doubt - run Opera Mini, it's free to download and it's about as secure as it's going to get. There aren't really any viruses for the symbian phones, it could happen but put it this way; You'll have more chance of getting a virus or a security breach running Windows with protection than you will with a symbian phone!
How to watch Wimbledon 2015 live online: follow the tennis from your laptop or PC