Hello JasonParker,
Even though both lines are under the same account, unfortunately, it is not possible to transfer the plans. The plans are associated with the phone number and are non-transferrable. However, you would be able to switch phone numbers (ie switch SIMs) and therefore the associated plans.
Hope this helps 
Cheers
Hello again,
Cawtau wrote:...able to switch phone numbers (ie switch SIMs) and therefore the associated plans....
No, you would have her phone number and she would have your phone number.
Cheers
@JasonParker wrote:
Why do you even bother proviong such a obious/useless "solutions"?
Do you think you dealing with children here?
Hello again,
It may be obvious, but it's the only way to switch the plans between yourself and your wife.
Cheers
