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2. Roaming SIM - Wikipedia

   en.wikipedia.org/wiki/Roaming_SIM

   Global roaming SIMs are very often combined with callback technology, whereby the user dials a number in the normal way, but the call is intercepted by an application on the SIM card and turned from an outbound call to an inbound call which the user answers. This ensures that the call travels exclusively through the least cost route, and also ...

3. Roaming - Wikipedia

   en.wikipedia.org/wiki/Roaming

   In more technical terms, roaming refers to the ability for a cellular customer to automatically make and receive voice calls, send and receive data, or access other services, including home data services, when travelling outside the geographical coverage area of the home network, by means of using a visited network. For example: should a ...

4. Prepaid mobile phone - Wikipedia

   en.wikipedia.org/wiki/Prepaid_mobile_phone

   This was because the operator had no way to bill calls in real time from another network. However, most prepaid phones now offer roaming using one of the following methods: The prepaid mobile phone user dials a "trigger" number from the foreign location using a USSD message which is not charged for while roaming. Upon receipt of the USSD, the ...

5. GSM services - Wikipedia

   en.wikipedia.org/wiki/GSM_services

   Incoming calls are free to the mobile subscriber with the exception of receiving a call while the subscriber is roaming as described below. However, callers typically pay a higher rate when calling mobile phones.

6. Prepaid telephone call - Wikipedia

   en.wikipedia.org/wiki/Prepaid_telephone_call

   Prepaid online calling cards are more convenient to use, because most of the companies provide the option of registering the phone and avoiding using PINs at all. Rates vary from provider to provider, but the customer should be aware that cards with cheaper rates usually have hidden maintenance and/or connection fees.

7. List of mobile network operators of the Americas - Wikipedia

   en.wikipedia.org/wiki/List_of_mobile_network...

   These U.S. territories have 3 million subscribers in total, or an 84% penetration rate. [148] (June 2012). June 2012). The telecom regulator for Puerto Rico and the United States Virgin Islands at federal level is the United States' Federal Communications Commission (FCC).