EXHIBIT 21.1

SUBSIDIARIES OF THE REGISTRANT

1. Allume Systems, Inc., a California corporation.

2. Tag Acquisition Corporation II, a Delaware corporation.

3. E Frontier Acquisition Corporation, a Delaware corporation.

4. IS Acquisition Sub, Inc., a Delaware corporation.

5. Tel Acquisition Corporation, a Delaware corporation.

6. STF Technologies, Inc., a Missouri corporation.

7. Smith Micro Software LLC Belgrade, a Serbia corporation.

8. Smith Micro Software UK Limited, a United Kingdom corporation.

9. William W. Smith Software Canada. Ltd., a Canadian corporation.

10. Smith Micro Software, Asia Limited, a Hong Kong corporation.

11. Mobility Acquisition Corporation, a Delaware corporation.

12. Core Mobility, Inc., a Delaware corporation.