You dont get charged corkage at boarding.
You would only get charged if you bring the bottle to a bar or restaurant.
if you enjoy the wine in your stateroom, or even if you bring a glass out of your stateroom, no corkage
There is no free Wi-Fi however, you can use the app without paying for any Wi-Fi. You can connect the app and make dinner reservations and check schedules and so forth for free.
Not like Cunard, but they do offer scones and other afternoon treats in the buffet. If you want a served tea in lovely tea pots, you won’t find it on Celebrity.