It is not allowed to use an operator's name as a sender.
Dynamic alphanumeric senders are allowed.
Dynamic numeric senders are not allowed but not excluded by T-Mobile and Orange.
Shortcodes are allowed.
It is not allowed to promote a premium service using free messages.
There are content restrictions on operator spoofing and gambling besides those that prevent abuse (spam, phishing, etc).
All Polish operators return Handset DLR.
All Polish operators support Concatenated SMS.
All Polish operators support Unicode.
CM has indirect access to an MNP database of Spain.
CM has direct connections to operators through a local partner.