So, sim card, depending on model, has only fiew kB of memory in them, and holds only fiew things in that memory:
uniq id, so carriers can identify you
temporary data for carrier, etc..
Any phone, that you can now buy, supports multiple frequencies, that it can send data through..
If this is true, does sim card has any say in what type of network speed you can use? And if so, then why?
Co's, as far as I understand, it's phone that has to be 4g ready, or 3g ready, not the sim.. you must have 4g plan from our carrier, ofc, but it's only matter of carrier plan..
I'm seeing so many articles saying that sim card must be "4g ready".. But I fail to find any info on why would a sim card have any impact on the matter..
Hope someone will be able to explain this to me.. (sources would be appreciated)