1. Get a local SIM card for GSM phone.*
2. Forward your US number to your Skype number.
3. Forward your Skype number to your European GSM number.
This way, people can call your local number and you can talk to them without paying international roaming. Calling the US won’t be cheaper on your mobile phone; for that, use Skype on your laptop while online.
* This requires that you have an unlocked GSM phone. Many GSM phones can be unlocked; just Google for those services or pay your provider for the privilege. I used a really old Nokia phone for years but got a web-ready PDA-phone in January so I can also get email on my phone — a godsend. Also, most providers in Europe sell pay-as-you-go SIM cards that don’t expire; that’s just reason No. 476 why their phone system is better than ours. The EU is also limiting roaming rates within Europe.
Also, Dave, find out whether you need an adapter on the plane for your laptop power. If you’re taking your MacBook, you have to buy that adapter from Apple and only Apple because it has the proprietary magnetic plug.