What devices are you trying to "switch"? If you are trying to activate a 4G device, and you have the SIM card, just put that in the phone and follow the prompts on the screen to activate it. You shouldn't need to go online at all. You can also call customer service at 800-922-0204, choose 4 for "Other options", and then say "Agent" to talk to a real person.
If you have switched plans, added or removed features, or otherwise made changes to your account, that may be the reason for the message - and it's "pending" until the end of the billing cycle.
