Answer
ArcGIS Mobile 10:
Mobile 10 Update 4 = Build 2550
Mobile 10 Update 3 = Build 2525
Mobile 10 Update 2 = Build 2500
Mobile 10 Update 1 = Build 2475
Mobile 10 = Build 2414
ArcGIS Mobile 9.3.1:
Mobile 9.3.1 SP 2 Quality Improvement Patch = Build 4050
Mobile 9.3.1 SP 2 = Build 4000
Mobile 9.3.1 SP 1 = Build 3500
Mobile 9.3.1 = Build 3000
ArcGIS Mobile 9.3:
Mobile 9.3 SP 1 = Build 1850
Mobile 9.3 = Build 1770
ArcGIS Mobile 9.2 (SDK only):
Mobile 9.2 SP 6 = Build 1500
Mobile 9.2 SP 5 = Build 1450
Mobile 9.2 SP 4 = Build 1420
Mobile 9.2 SP 3 = Build 1380
Mobile 9.2 SP 2 = Build 1350
Mobile 9.2 SP 1 = Build 1332
Mobile 9.2 = Build 1324