Yes, you can use your cell phone on St.Martin to call inside the island or to anywhere else. I called *611 on my cell, pressed 4 a couple of times and got a CS rep. He added the international dialing feature.
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Maarten/St. Martin. Tap water is safe to drink, but bottled water is recommended. High-SPF sunscreen is essential and recommended for those not used to intense sunlight.
The US Dollar is accepted everywhere on the island. Local currency and US Dollar ATM machines (Maestro/Cirrus) are situated throughout the island. Major credit cards are accepted in most tourist establishments.