Just as an FYI, if the SIM in the old phone doesn't fit the new phone, Rogers have a special device, like a small hole punch that can trim the SIM to fit the new phone. You insert this SIM into the new phone and you're off to the races. Make sure you check it works before leaving the store.
As @Pauly mentioned, some people do not recommend trimming the SIM (by which they may mean doing it yourself using scissors). I do not recommend that either since a new SIM is only $10.
Since mistakes can be made in transferring account details, etc, to the new SIM, I call it a wash whether it's "safer" to have the SIM trimmed at Rogers, or purchase a new SIM. If it's easy to get to a Rogers Store, the process is really easy. If it's difficult to get to a store, then the answer can different.
Thanks 57. Just one more thing to mention. I was not only a Certified Mobile Repair Technician, I was also the Head Manager of the Handset Repair Facility.
Rogers does not use the SIM card Punch Out tool, if you saw any location that used it, then they are doing it at their own risk and should not be doing it, or they are a Third Party Authorized Retailer, and are doing so at their own will and Rogers policy can not prevent them from doing such.
The one reason that its not recommended to even use a SIM Card Punch tool, is that the the NanoSIM is also by 0.08 mm thinner than the MicroSIM, so your sim card Tray or Slot on the new phone is expecting a Nano sim with a certain thickness but your putting a sim card with thicker dimensions in it, this could cause damage to the SIM Tray or reader, and can even cause intermittent signal issues or connection issues.
Thanks for the link. I read the article, and I also read all the comments. Makes for some interesting reading. If you want to be safe, get a new SIM. I did go to a Rogers store, but it might be "third party." My phone is fine.