I plan to work in New York for 6 months to one year next year. I'll need a cell phone for work purposes mainly. Should I use my current phone and buy a Sim card in the NY or buy a phone with a data plan from a service provider. I'll need a data plan too. Which service provider would you recommend specifically for making international calls.
A lot of your decision should be predicated on how many local calls you'll need to make, and how much local business you need to conduct.
I live in the Hudson Valley area of New York. A few years back I was doing business in a area about an hour from my home. A good deal of my business involved calling, and being called by my customers. I found that many customers wouldn't call me or return my calls because my phone number was in a different area code, and therefore, a long distance call.
However, in your case, if you're going to be conducting a great deal of international business, this may not be an issue.
I thought Elliott's suggestion was a good one. The only thing I would be concerned about is the speed at which calls would be forwarded to you. That was another thing I encountered; If a customer couldn't reach me, they immediately called the next guy.
As far as which provider offers the best international service, you'd probably be best served going to an on-line review site to see what customers of the various providers have to say. If you find one that sounds good, spend some face time working out a deal with them. They want your business, and a web site doesn't understand that desire.
Let us know how you make out.
I suggest keeping your current phone and phone number - then augment it with a local number.
There are lots of services, such as SKYPE, that allow you to buy a local phone number - a number with the area code you want - then have all calls immediately forwarded to your cell phone.
I think this is a more reasonable approach than buying a cell phone with a new sim card or putting the sim card into your existing card - an no longer use your old number.