Another solution would be to either rent or purchase a global phone with data capabilities from Verizon and you could keep your phone number overseas. There are such things as dual standard phones (including some smart phones with keyboards) that can work both in the USA on the Verizon network and outside the USA on GSM networks. Cost would be higher for data and voice than Stan's excellent suggestions, but if you need the convenience and your business is willing to finance this for a quick and reliable solution it might be worth considering.
Verizon's solution:
http://aboutus.vzw.com/international...utside_us.html
Phones/Wireless Devices: Doogee S90, Isatphone Pro, Amazon Kindle 3G, SkyRoam MiFi device, Karma MiFi device, AT&T Liberate MiFi device
Sim Cards: T-Mobile (Mint), AT&T (Mifi device or Kindle), Koko
Satphone: InMarSat
Broadband US Wireless Data: AT&T postpaid, Sprint (Karma Mobility prepaid)
Broadband International Data: SkyRoam
VOIP: Skype