Is he in the EU?
If not then the roaming add-ons are no use and he will need cash credit on his account to make/receive calls and send texts although he can receive text for free.
Other call charges
Unfortunately you can only gift topups and membership but not add-ons through the gift shop:
Gift shop
You might want to text him and tell him to get to a wifi hotspot in order to get online and topup or buy add-ons if necessary.
Hope this helps.
