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The Local _ Telecoms _ 4G SIM Card

Posted by: p201055r 16.Jun.2016, 08:20 PM

So today I got an SMS from Comviq inviting me to get a 4G SIM for free (the reality is if you order through their phone service you are charged 95SEK, but if you order online it's free).
Because I had some difficulties with their website, I called (that's when I found out about the 95SEK charge).
The conversation seemed to me to be more about getting me to open a contract account and/or eliciting my personal details - personnummer, address etc - than about the SIM.
So, my questions are these -
Why can't the 3G data on my current SIM, sitting quietly in its iPhone 6, be updated over the air?
Is there really such a thing as a 4G SIM?
Is such a card really a necessity?
Thanks in advance for any technologically sound advice!

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