If you want to stay in touch with people in the US/Canada/some counties in Europe order a Vonage phone service device in the US and bring it with you. You will need to have internet and a computer. I have a Vonage device with a US number...and I can call free to the USA, Canada, Spain, Italy, England and a few other places. Also, folks in the US can call me without dialing an international number. I actually have two numbers - one in Florida and one in Pennsylvania, so for those folks, it's a local call to reach me in Buenos Aires.
Second thing is a device called Magic Jack. It plugs into the USB port on your computer and then you plug a phone into it and call the US for free. This costs $40 to get,and then $20 a year. You can also use head phones if you wish.
I have both and they work well, nice and clear.