How does a SIM card store data such as voicemails, contacts, etc.? How much data can a SIM card hold? If, then, it connects to the internet, how so?
In: Technology
A SIM card isn’t all that special – it is just a specialized form of [smart card](https://en.wikipedia.org/wiki/Smart_card) designed to hold specific kinds of data rather than be general purpose storage.
SIM cards can come in various data capacities, from 8 KB to at least 256 KB. All can store a maximum of 250 contacts on the SIM, but while the 32 KB has room for 33 mobile network codes (MNCs) or network identifiers, the 64 KB version has room for 80 MNCs. It doesn’t store voicemails – those are stored on the phone itself or on your carrier’s servers.
The card itself doesn’t connect to to the internet – your phone does that – but rather the SIM provides the credentials to allow you to use a particular carriers network.
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