"Charlie Tester"

[GTOJim]

What worked for me last time I had a call waiting was to use the flash button to answer the incoming call. When the call ended I hung up rather than pushing the flash button to get back to the previous caller. Hanging up caused the phone to ring, answering the phone got me back to the original caller.
When ever I used the flash button to go back to the first call I always lost the caller.

Don't know if hanging up to end the conversation with the second caller will always work but it worked the one time I tried it, got me back to the first caller.

Update: Call just came in while I was on the phone, the process I described above failed. I lost the first caller.