The U.S. Navy's Spiral 4 contracts are mandatory for cellular phone, wireless devices, and wireless service purchases. Cardholders may purchase respective cellular requirements up to the MPT from any listed vendor (AT&T, T-Mobile, Verizon, Sprint, MetTel). All purchases must comply with the Spiral 4 – Mandatory Ordering Guide. Orders may not exceed one year and are only authorized in CONUS due to task order limitations with the GPC. See https://my.navsup.navy.mil/apps/ops$ncmpo.home.