I have a Samsung Galaxy S7. I am traveling from the US to England and France next week. I know there is no international roaming option, but I would like to confirm my options with someone who has Virgin Mobile and still used their phone while abroad. I don't really need to make calls, but I would like to be able to post pics on Instagram and to "text" via apps like WhatsApp. I believe that, as long as I am connected to wifi, I will be able to use apps like Instagram, Facebook, and WhatsApp. Is that correct? And I will NOT need to purchase a SIM card or anything like that? Thanks!