Sender ID:
There are no known restrictions on Sender ID to most of Germany.
Content:
Social invites:
As of April 2016 Social Invites are not allowed by T-Mobile Germany.
Our direct link to Germany is otherwise fully-featured, including support for:
- Dynamic Sender ID
- Concatenated messages
- Unicode messages
- Local time stamps
- Ported number delivery
Other features/restrictions of note:
Delivery Receipts:
Handset DLRs are fully supported and are considered reliable
Links:
Global SMS Features Overview (Outbound only)
Global SMS Numbers Features Overview