So I bought a red Lumia 920 on Axiom Telecom .... I should get it in the next few days. I already bought a micro LTE SIM card for the phone. Do I need to call Rogers to activate it or can I do it online? I did'n t see any option in "My Rogers" page.
That is correct. On your My Rogers page - Overview, you will see the option saying " Change Sim Card". Press that and it will show you 2 boxes. One box is where you add your currect sim card number and the next one is the new sim card number. Once you are done, press done and it should change it. Once you change sim cards, your old sim card can no longer be used. Its useless so I would throw it out if you have no contacts saved on it.