I've had a Siemens A51 for several years now, it works great in Europe (UK, France, Belgium, Germany). On the box it says "GSM 900/1800/1900. Recently, on a trip to Anguilla, it would not connect to any of the local GSM services (Digicel and Cable & Wireless), It also worked in St. Martin. The phone also works here in the U.S. roaming on T-mobile.
Anyone know why this phone does not work in Anguilla?