After I changed a plan online, my phone displays No Service now. I can neither call nor access to internet.
Anyone encountered the same issue before? The online customer service couldn't help.
That's definitely an odd situation, changing your plan shouldn't trigger any trouble with your SIM card or your network connexion.
If this is still ongoing, please let us know so we can send you a PM on the community as we'd need to have it escalated with our Technical Support.
Keep us posted!