images in safari not displaying when I'm on 3g after 5.1.1 update

Hi - I updated by iPhone 4S last night to 5.1.1 and since them I noticed that when I'm not on WiFi (and on Telus 3G) on some sites I'm browsing on Safari images do not show up (just a little ? mark) As soon as go on WiFi they work - and I had my friends just check on a 4S running the older 5.1 and they work fine...any thoughts??