Network Update - Some Clarifications for new customers

[firstohit]

I am a new customer, switch to Visible last month. I keep hearing about network update. I didn't get any notification. but I am curious:

What is the new network all about? 

What exactly have changed?

I think I am already on the new network being a new customer but how can I check which network I am on?

Thanks

[Anonymous]

Last August Visible upgraded to the Verizon core system from the old cloud based system. If you joined a month ago you are on the network upgraded system.