A standard cooling fan is essentially a bladed DC motor. By varying the voltage input across the acceptable range for a fan, the speed of the fan will increase (to added voltage) and decrease (to reduced voltage); a faster fan means more air moved and thus a higher heat exchange rate.
Contact them toll-free from a Vodacom cellphone by dialing 111. Contact them toll-free from a Telkom phone by dialing 0800-111-234. Note: Telkom toll-free numbers are generally NOT toll-free when dialed from a MTN/Vodacom cellphone.
Quick Answer. The phone number for T-Mobile customer service is 877-746-0909, as of 2015. Customers can dial 611 for customer service when calling from a T-Mobile phone. Hearing or speech-impaired customers can call 877-296-1018.