Are you using that new Android you got not long ago as your everyday device?
I am using 2 Androids currently...
Down to 2 Windows phones sadly

My 535 is in it's box unused in the drawer along with the 925.
I'll grab the 640 if it does eventually show up at WalMart however.
I want the T-Mobile branded phone specifically...
I did like the form factor of the 535 and the 640 seems like the next step.
I'll put my data SIM in there and internet share from the 640.
T-Mobile tells me band 12 is working in our locale.
When/if I get the 640 I'll retire my Xperia and keep the ZF2 up.
Hoping you can get hold of the 640 metalchick!
Good luck there!