US phone numbers consist of area code, exchange code, and subscriber number. Area code identifies geographic region, typically 3 digits. Exchange code narrows down location within area code region. Subscriber number is 4-digit unique identifier for specific line
Telephone numbers follow national plans with closed or open formats. E.164 standard defines international numbers with maximum 15 digits. NANP uses 10-digit numbers with first three digits as area code
Delivers TV via RF signals through coaxial or fiber-optic cables. Contrasts with broadcast TV and satellite TV. Can provide FM radio, internet, and telephone services
Landlines use area codes, mobile phones don't. Domestic calls start with "0" for long distance, omit for international. Large cities have 8 digits, other areas 7 digits
Belarus adopted +375 country code in 1995, replacing Soviet +7. Local numbering plan inherited from Soviet Union with few changes. Area codes removed leading 0 from previous 3-digit USSR codes
SIM cards are essential for cellular service in new Android phones. Carriers provide SIM cards for both new and upgraded phones. SIM size must match phone's requirements