Originally Posted by s8n666
Check your router and make sure it is broadcasting b/g/n and not just one of the 3. Then check if mac address filter is enabled. If it is, add your iPhone mac address to the list.
As far as I can see the router's configured as above - however, there doesn't seem to be an option to add my iPhone's mac address (dumb question, BTW - where in settings do I find this? I've only had the iPhone for two and a half weeks)