Roaming sim cards:
These are the sim cards that provide low coast data and voice roaming all over the globe.
There are MVNOs that provides roaming sim cards. These MVNOs have connections to all mobile network operators worldwide.
Sim cards have multi IMSI support. An IMSI is identified as a country and mobile operator in that country.
When sim cards roam in a country, the IMSI is changed dynamically over the air and sim becomes the local sim for that country. This way the roaming sim providers offers the low cost call and sms.
Each MVNO has APN assigned for the Data services.
These are the sim cards that provide low coast data and voice roaming all over the globe.
There are MVNOs that provides roaming sim cards. These MVNOs have connections to all mobile network operators worldwide.
Sim cards have multi IMSI support. An IMSI is identified as a country and mobile operator in that country.
When sim cards roam in a country, the IMSI is changed dynamically over the air and sim becomes the local sim for that country. This way the roaming sim providers offers the low cost call and sms.
Each MVNO has APN assigned for the Data services.
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