Yes, you can use your cell phone on St.Martin to call inside the island or to anywhere else.
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The island has several cellular phone carriers, namely TellCell and UTS (Chippie) on the Dutch side. Visitors can purchase SIM cards at many locations for as low as $10 (plus $10 for prepaid phone minutes). Incoming calls are free.
St. Martin (French) or St. Maarten (Dutch) does not have any particular customs procedures at work. Small quantities of personal products like tobacco, electronic equipment and alcohol are allowed free of duty.
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.
American or Canadian citizens must present a valid passport and a connecting flight or return ticket. For naturalized citizens, you will need an original naturalization certificate with an identity photo. The maximum authorized stay on St. Martin for tourists is 3 months.
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.
When you arrive St. Maarten, you will pass through Immigration, which can take 10 minutes or 90 minutes, depending on which flights have arrived just prior to yours.