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2. Customer service - Wikipedia

   en.wikipedia.org/wiki/Customer_service

   Customer support. Customer support is a range of consumer services to assist customers in making cost-effective and correct use of a product. [9] It includes assistance in planning, installation, training, troubleshooting, maintenance, upgrading, and disposal of a product. [9] These services may even be provided at the place in which the ...

3. Telephone numbers in Italy - Wikipedia

   en.wikipedia.org/wiki/Telephone_numbers_in_Italy

   Geographic landline numbers start with the digit 0, while mobile telephone numbers start with 3. Four types of emergency services use three-digit telephone numbers in the group 11X, including 112 for the Carabinieri. Other initial digits denote other services, such as toll-free numbers.

4. Prime number - Wikipedia

   en.wikipedia.org/wiki/Prime_number

   A prime number (or a prime) is a natural number greater than 1 that is not a product of two smaller natural numbers. A natural number greater than 1 that is not prime is called a composite number. For example, 5 is prime because the only ways of writing it as a product, 1 × 5 or 5 × 1, involve 5 itself. However, 4 is composite because it is a ...

5. Telephone numbers in Greece - Wikipedia

   en.wikipedia.org/wiki/Telephone_numbers_in_Greece

   Telephone numbers in Greece. This is a list of dialing codes in Greece. The first digit represents the type of service. 1 is used for short codes, 2 for geographical numbers (3 and 4 are reserved for that purpose too), 5 is used for inter-network routing purposes (non-dialable codes) and VPNs, 6 for mobile services, 7 is reserved for universal ...

6. Premium-rate telephone number - Wikipedia

   en.wikipedia.org/wiki/Premium-rate_telephone_number

   In Japan, premium rate telephone number service was currently known as "Navi-dial" and began with the prefix 0570 followed by six digits. The "DIAL Q 2" service that's number had the prefix 0990 was ended operations in early 2013. South Korea. Premium rate numbers start with the prefix 060 followed by 7 or 8 digits.

7. Telephone numbers in Brazil - Wikipedia

   en.wikipedia.org/wiki/Telephone_numbers_in_Brazil

   In contrast to emergency numbers, which are always toll-free, calls to such services may or may not be charged. Landline telephone companies' customer service numbers have been normalized as 103, followed by a two-digit code. For example, Embratel customers contact the company's customer service dialing 103-21.