To answer your question, the international add-ons only apply to international calls being placed from inside the US. Therefore, they would not support calls being placed from Europe.
Hope this helps!
I can't vouch for the S7 specifically, but my family and I have purchased various phones from Virgin and I don't think any have had custom branding, though I'm not totally sure. I can say with certianty, though, that my current phone, a Galaxy S5, has no custom branding, which was the same for the S3 I owned.
u can buy a new iphone from virgin website and when u get just log into your account a swap the phone out and then u can use your wife old phone on your account just do the same thing just swap the phone on your account
DDR is migrating their numbers to virgin . There's no specific date, but as soon as the migration process finishes, they'll close. In order to start this migration, please contact virgin at [***personal info removed***] to better assist you