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The use of roaming SIM cards in its most common form is in normal voice applications such as mobile phone calls. The common application of roaming SIMs for voice is where mobile calls are automatically routed to, and made on, the least cost network. This typically means that incoming calls are free, no matter which network a mobile user is on.
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 ...
CAMEL Phase 1 defined only very basic call control services, but introduced the concept of a CAMEL Basic call state model (BCSM) to the Intelligent Network (IN). Phase 1 gave the gsmSCF the ability to bar calls (release the call prior to connection), allow a call to continue unchanged, or to modify a limited number of call parameters before allowing it to continue.
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.
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 customer's operator will then return the call. When the service calls back, the user is being charged for the cost of the service from the credit available in the home network.
Mobile Termination Rate (MTR) for video call is yet to be fixed by operator / regulator. International voice termination to Bangladesh is 1.5 [18] US cents per minute. Termination charge for calls to Basic (Fixed, Wireless (Fixed), and Mobile with limited mobility) and Cellular networks would be uniform @ Rs. 0.30 per minute.
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Free number to call for detailed roaming and information information any Not regulated Yes Free '112' access in roaming any Not regulated Yes Wholesale caps (Operator to Operator) [7] Outgoing calls to any EEA number price of 1 minute any 0.30 0.28 0.26 0.22 0.18 0.14 0.10 0.05 0.032 0.022 0.019 billing interval any Not regulated