Telephone-based salespeople are in a Bear-pit...they are in direct contest with the people sat around them. If you go off the phone for
any reason, then if and when ring back you will inevitably end-up speaking to someone else and thereby giving the business / commision to someone else.
So even though they may huff and puff about how its the best deal they can do and how discounting is impossible due to the high demand etc, etc, etc - the last thing they want is for you to go off the phone, because all of their effort will have been a waste and they end up with exactly 0% commission.
In such a situation, if the price is still too high for you, then it often works wonders to say something along the lines of:
"Well Bob, i'm gratefull for all your help with this, but i am sorry - i'm going to have to go and shop around some more as it is just
too expensive /
too long a contract / not enough monthly minutes etc,etc,etc" - "Its a shame really , because I need a new phone
now and i really wanted to get this sorted out
today"
Then say ABSOLUTELY NOTHING MORE (there is great leverage in an embarassing silence)
Within 6 seconds ( try it, it works !) the salesperson will feel obliged to speak in order to break the silence and will say "Hang on, i'll see what i can do with these figures...."
If they still brave it out and maintain that they cant do a better deal, then you have either hit the lowest commision / best deal already or you have found a very brave salesperson, in which case you have lost nothing and you can still walk away
This has always worked for me - i hope it is of assistance
Remember "beat that price till it hurts !"
Regards