Using koodo assist like @Dinh mentioned above is your best bet. Just say it's for your phone you bought online, and then request a callback, this way the webstore will be the one that calls you instead of regular customer service. You can schedule it for a time you will have better reception
Just pop your old sim from the S7 into the S8. And keep the newer sim as your spare. If you ever want to use the new sim you can transfer every over on self serve. Note that once a sim has been used, it cant be used with another line, and it also becomes permanently deactivated so no one can use it...
Moving yoursim over will not impact your billing or plan. If you login to self serve you can see your current plan. THe sim is just your phone number so you can use your phone and connect to the network
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