UM Data sim card bundle

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Originally Posted by inquisitor

They charge as many connections as sessions you've established. Theoretically a session could last days, but practically it will be interrupted at least once per day. If you move with your phone during a session and so lose the signal for a moment or if a bad handover occurs, the session will also be interrupted.

The session is on hold from the network if a handover is not successful or if you drive into a tunnel or out of coverage. Depending on the provider it times out after several minutes.
T-Mobile D for example keeps the old session open for 45 minutes - if your device reconnects to GPRS while this timeout the old session key will be used and thus no new connection fee should be charged.

Chris