Can I upgrade my current package to more lines/connection?
You can upgrade but only when the length of your current subscription is finished.
For example if you have a 12 month 3 line/connection package and want to upgrade to 5 lines/connections, you can't unless the original subscription is finished.
You can purchase the 2 extra lines on their own and do your best to match the time you have left on your original package. Then once everything expires you can buy all the lines together.