Features:
+ Telephone per address
+ During checkout, add telephone field for new payment address and new shipping address
+ Admin can view/edit this telephone with order
+ Phone number is included in invoice
+ Customer can edit this telephone in address book

Demo:
Store front
Admin

You can contact me directly at trile7@gmail.com

v0.1.3
- Fixed phone number disappear if page is refresh
v0.1.5
- Fixed add telephones to order when an existing address is picked
v0.1.6
- Added shipping and payment phone number to invoice
v0.1.7
- Fixed guest checkout
v0.1.8
- minor codes change to be more forgiving during vqmod search
v0.2.2
- update installation procedure
v0.2.3
- fix error on step 6 of checkout process
- add disable feature
v0.2.4
- fixed installation for older php
v0.2.5
- Update installation process
v0.2.6
- Add telephone to confirmation email
v0.2.7
- Add feature to allow admin to edit custom phone field