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.
Submitting Complaints. Submit complaint to AT&T. Reach customer service by calling (800) 331-0500. Submit a complaint letter to AT&T Headquarters, AT&T Inc., 175 E. Houston St., San Antonio, TX 78205.Also submit a complaint letter to the wireless division at AT&T Mobility, 5565 Glenridge Connector, Atlanta, GA 30342; send a copy to its fax at (866) 783-9099.ubmitting Complaints. Submit complaint to AT&T. Reach customer service by calling (800) 331-0500. Submit a complaint letter to AT&T Headquarters, AT&T Inc., 175 E. Houston St., San Antonio, TX 78205.