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Old 26th November 2021, 11:44 PM   #1
novaphile
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Network Upgrade took out both of my phones

Well this is funny...

Last week, my mobile (cell) phone suddenly stopped working.

The provider advised that there were tower upgrades going on in my area, and the outage would be very temporary.

It wasn't.

I pulled out my back-up phone, and found that it could no longer connect either.

Days went by, where I tried everything I could think of, and the provider continued to advise me that things would be working 'real soon'.

Of course, there are some things that require SMS for two-factor authentication, and that meant I was locked out. (Neither phone was able to do SMS via WiFi)

The provider recommended that I pick up a free, new SIM card, so that I could at least use phone over internet so that I could keep going while they tried to work out the network issue.

Hey presto! New SIMS and both phones were immediately working perfectly again.

My best guess?

There's been some kind of protocol change, and my old SIMS were not able to use the new protocol.

Four days of hassles that I could really have done without.

Both phones are now showing new features, so I've learned something else.

Android doesn't show features if the SIM card doesn't support them.

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Old 29th November 2021, 04:48 AM   #2
a_unique_person
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I thought a SIM was pretty much just a piece of smart memory.
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Old 29th November 2021, 05:17 AM   #3
Crazy Chainsaw
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Originally Posted by a_unique_person View Post
I thought a SIM was pretty much just a piece of smart memory.
It is, basically a registration code and information about the phone,
Android will not display apps if the phones software does not support them, nor does Apple nstalling the wrong App could cause the phone to crash.
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Old 3rd December 2021, 04:51 PM   #4
novaphile
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Actually, no.

From wikipedia:

A SIM card contains a unique serial number (ICCID), international mobile subscriber identity (IMSI) number, security authentication and ciphering information, temporary information related to the local network, a list of the services the user has access to, and two passwords: a personal identification number (PIN) for ordinary use, and a personal unblocking key (PUK) for PIN unlocking. In Europe, the serial SIM number (SSN) is also sometimes accompanied by an international article number (IAN) or a European article number (EAN) required when registering online for the subscription of a prepaid card.

https://en.wikipedia.org/wiki/SIM_card

So, as I said, it's most likely the network upgrade dropped a protocol that my SIM was trying to use. (Or telling the phone to use if you prefer)

Note that the second highlighted item above explains why new features became available with the insertion of the new SIM card.

Going back to the conversation with one of the technical support staff online:

"I can see that your account allows using the internet for making calls and sending receiving SMS via the internet, perhaps your SIM card doesn't support that? Pop into one of our stores for a free replacement SIM card, that should cure that problem at least."

Perhaps they should have said: "Perhaps your SIM card doesn't list that as an available service?"
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