Modem Voice Support
A look at what is currently available on eBay
 Unlocked Huawei E171 / E173 HSDPA GSM 3G USB Modem 7.2 Mbps Support Voice Calls US $29.00 
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 Unlocked ASUS T500 PCI Express 3G Modem Support Voice US $125.00
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Items recently purchased from this site
Unlocked ASUS T500 PCI Express 3G Modem Support Voice, Unlocked Huawei E171 / E173 HSDPA GSM 3G USB Modem 7.2 Mbps Support Voice Calls,