To secure an application that you might run between two branch offices over GPRS, you can secure the application stream itself or create a secure network layer VPN between two offices (or between a mobile device and a branch office). To secure an application stream by itself, try using TLS or Secure Shell. To create a secure VPN between two sites, you can use IPsec. To learn more about using VPNs over GPRS, here are some white papers: Secure VPN Deployment in GPRS Mobile Networks (PDF); Mobile VPNs for GPRS and UMTS Networks (PDF).
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