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The HLR will send to the VLR a MAP PRN (Provide Roaming Number) message to obtain the MSRN of the roaming cell phone. Like that the HLR will be able to route the call to the correct MSC. With the IMSI contained in the MAP PRN message, the VLR assigns a temporary number known as the mobile station roaming number (MSRN) to the roaming cell phone.
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.
Finally, if the Home Location Register knows that the phone is roaming in a particular VLR area, then it will request a temporary number (called an MSRN) from that VLR (using the IMSI as the reference number). This number is relayed back to the Gateway MSC, and then used to route the call to the MSC where the called phone is roaming.
With Three joining the list of networks to bring back roaming fees for using data in Europe, we look at the costs for all of the main providers.
The Preferred Roaming List (PRL) is a database residing in a wireless (primarily CDMA) device, such as a cellphone, that contains information used during the system selection and acquisition process. In the case of R-UIM -based CDMA devices, the PRL resides on the R-UIM .
Tizana Fabi, AFP / Getty Images Travelers who use smartphones like the iPhone and the Google Nexus to check their e-mails or find their location on an online map may be slapped with unlimited ...
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