I was only able to link up to 3 more people including the original call that I made which puts the total conversation up to a total of 5 people. Even if the manual said 5 + 1(caller). I guess I reached TMO USA's MAX amount of users on it.

Although the networks should have a good amount of bandwidth for 1000s of connections at one given time. I wonder why it wouldn't let me connect more people. Is it because of one call trying to saturate an amount of air bandwidth that the network just wouldn't allow or it just doesn't have enough bandwidth???

I don't really think it wouldn't have enough bandwidth since every second in 1 day there's always someone on the same network in my area making a call or doing something to use of air bandwidth. **shrugs**