GPRS Increase data receiving speed

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VB

Following code is already running. No any errors.

Actually, we have multiple devices in fields.
Each device has own GPRS Modem.
All devices are sent data over GPRS network using this modem.
In PC side one application (above written some code) using UDP protocol to get the data from GPRS server.

My question is that when more than 5 devices are sent data at a time no difference in time to send data over GPRS server than many data are lost and discarded.

PC side application can not receive all device data.
Can you suggest me what can I do for receiving all data which are sent at a time?

Private sub ReceiveServer()
  While 1=1
    try
       '--- Receiving Method
       If client.Client.Available > 0 Then
	  mintGPRSPort = CInt(RemoteIpEndPoint.Port.ToString)
          ReDim bytes(0)
	  bytes = client.Receive(RemoteIpEndPoint)
	  clientdata = ""
       	  clientdata = Encoding.ASCII.GetString(bytes).Trim
          debug.print(clientdata)
       end if
   Catch ex As Exception
      Call LogError("ControlInterface.clsGPRS", "DataRequest", Err.Number, ex.Message, ex.StackTrace)
    End Try
  end while
end sub

Thanks...