I have an existing account with Koodo and currently have the Samsung A5 on a medium tab. I'd like to also add the Essential phone on a medium tab. Can I have 2 phones on a tab at the same time (therefore adding $30 to my monthly bill instead of $15)? If so, how do I buy it online? When I add it to my cart, it forces me to add a plan to my cart too, but I don't want a new plan, I want the phone on my existing plan.