I imagine the only one's who can tell you that, would be customer service. Not sure what phone you're switching back to, or from, but some (mainly 4G/LTE ones) may require a new SIM or something along those lines. I'd give them a call, as that seems the only way you'll get to the bottom of it.
yes its a 4G phone
samsung galaxy s3 how ever the sim is still active because its been less than 90 days
i used to do this before online with ease.
How long between the two switches. It takes the multiple systems a while to complete the switch. That is my guess the entire initial swap has not completed.