Hi Jean, welcome to the community your post has been flagged for assistance and you should hear shortly in the meantime please check your community profile and add your landline phone number if necessary it is used to identify your account.
Hope your holiday is going well otherwise.
Where are you ?
Try going into your phone settings and manually selecting a network and see if you get the usual SMS back about roaming.
In Thailand, I can register on 2 networks, but SMS messages never arrive on one of them.