Cell phones: Charging a European 200V cellphone in the US

Charging a European 200V cellphone in the US

I purchased a Siemens A55 in Norway a couple of years ago. It is now unlocked. I want to charge it up in order to use it this fall in Europe with a new SIM card. I t appears, however, that its charger is just for 220V. Is it possible to use an adaptor and plug it in to my shop 220 outlet (2 horizontal prongs)? Or should I just purchase a car charger for the A55? Thanks.