@Clive2 welcome. Porting is pretty straight forward. You will need to keep your current phone number active with Bell. Basically what I did was bought a SIM Card (look-up in your area where they sell Public Mobile (PM) SIM Cards, or order a SIM online through PM or Amazon. Keep checking this site for good activation offers (such as one time credits, or additional bonuses on plans). Would suck to activate and then a couple days later you miss out on a one month free offer or something. Once you see a nice deal then use the PM site to activate your new SIM on whichever plan you want. It's a pretty straight forward process, you shouldn't need help setting it up. There's a section that asks if you're porting and you'll need your existing Bell account number or the IMEI of the Bell phone you're using.
Complete the activation, which is only 3 computer screens and should take no more than 5-10 minutes really, and that's it. Put the new SIM Card in your phone and wait until you get text messages from PM (i.e. welcome messages, and successful port message) Also, give it maybe 15 -30 minutes for all the functions to work (i.e. inbound and outbound calls, outbound text messages, data service). These are not always going to start working immediately.
Technically you won;t need to contact Bell because they'll receive notice of the port and they will issue your final bill at some point that month or the next (should be prorated so recommend you check the cancel date they have on the invoice). Keep in mind if you're on a contract you'll need to pay that cancellation fee (which will be on the invoice).
