Bell internet usage not updating
You will still be able to use 3G and 4G networks when you’re away from a Wi-Fi network, however.
So Bell avoids this situation by ensuring that no customer can operate their own SMTP server, and blocking port 25 effectively does just that.
Here's why: A common feature of SMTP servers is open-relaying.
Open-relaying allows anybody on the internet to relay an email message through an SMTP server.
To turn cellular data on or off, go to Settings, then tap Cellular or Mobile Data.
If you're using an i Pad, you might see Settings Cellular Data instead.