My hourly rate is $10 if you wish to hire me for longer projects.
I have worked in the call center industry in Pakistan and have experience with talking to customers over the phone in the US and the UK.
I do not have any issues with working different time zone hours.
Please do figure out the technology aspect as to how I will be able to make or receive phone calls for you. If you haven't done this in the past, I would recommend you explore skype for different solutions.