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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 ...
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.
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.
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Without it, you couldn't get cell service because it contains your account information and phone number. But physical SIM cards are slowly being replaced by eSIMs — the e stands for embedded ...
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In telecommunication, a public land mobile network (PLMN) is a combination of wireless communication services offered by a specific operator in a specific country. [1] [2] A PLMN typically consists of several cellular technologies like GSM/2G, UMTS/3G, LTE/4G, NR/5G, offered by a single operator within a given country, often referred to as a cellular network.
After MSP Michael Matheson racked up £11,000 on data roaming charges, here's how to keep your spending low.