The user guide is entirely unhelpful, to be frank.\But, I did change the message settings to Public Mobile MMS as well, but since then have lost my internet connectivity. Picture messages don't send either. I've tried variations of the settings since...
I was so grateful to find this today! I'm currently setting up my Nokia 3310 3g for the first time, just purchased today, and the information here helped! Oddly, with these settings I can access the internet, but can't send picture messages? Unsure ...