New Sim card for a new phone

[Susieqtb]

I pay for my sister's phone and recently got her a new  phone. She lives far away and I don't have access to the old SIM. I  got a new SIM for the new phone but the old SIM is still working in her old phone. Can anyone help me figure out how to proceed putting the new SIM in the new phone while the old  SIM is in the old phone?

Thanks!

[Luddite]

@Susieqtb  You cannot activate a new SIM on your sister's account unless you can log into it. If you can't do that work with her to so you can access it.
The way I did this for my sister, was to change the account email address to one that I can receive. Then when I want to login I immediately click Did not receive SMS and click Send as email. 
If you are still stuck reply again in this thread. 

[Susieqtb]

I read in another thread that when the new SIM is activated by changing the number in the Public Mobile App that the old SIM would simply stop working. It was smooth as silk.

[Susieqtb]

My sister panics at any technical task and is not capable of this. Would have been the perfect solution.

[hairbag1]

@Susieqtb 

send sis the new phone with instruction to remove the sim outta the old phone and install it in the new phone.

[Susieqtb]

Once it's up and running, I'll send her the new phone.