The connector CRC-9 is used for pigtails for UMTS/3G USB sticks, PCMCIA cards and other UMTS/3G modems. Several (but not all!) modems by the manufacturer Huawei use this connector.
CRC-9 Plug42945 RG-316, crimp
Ready to use Pigtails with CRC-9
Pigtail CRC-940307.N-F30cm, N female
40307.S-F30cm, SMA jack, flange mount
40307.SFR30cm, RP-SMA jack, flange mount