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metsjetsfan

macrumors 65816
Original poster
Feb 2, 2011
1,342
213
Ive always just pulled my old SIM and replaced it in my new phone but I got this email from apple stating the below:


“When you receive your new iPhone, get a new SIM card from your carrier to activate on your phone number or insert an activated SIM. We recommend using a new SIM to get the most up-to-date features.”

Does anyone know if there are new features?
 

ericwn

macrumors G3
Apr 24, 2016
9,118
6,639
To my knowledge a SIM card carries no radio antennas or other technology components. It’s sole function is to identify you on a network.
 
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4sallypat

macrumors 68020
Sep 16, 2016
2,211
1,891
So Calif
The SIM card in the case of 5G technology, has additional data for the carrier being used.

This means if you use an old SIM, while it may work, might be limiting access to newer towers / frequencies based on old data.

On the TMO network, in order to use the SUB 6 and mmWave towers, we have to use the newer "R15" SIM chips.
 
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Paco II

macrumors 68020
Sep 13, 2009
2,285
706
AT&T CS are notorious for misinformation. They have SIM chips clearly marked 5G

They always brand their chips with whatever is the latest tech. It’s advertising. This is what a tier 2 support rep told me. 5G is working perfectly in my iPhone with my existing SIM. If AT&T required a new SIM, why wouldn’t they be telling us that?
 
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FHoff

Contributor
Mar 21, 2020
420
912
They always brand their chips with whatever is the latest tech. It’s advertising. This is what a tier 2 support rep told me. 5G is working perfectly in my iPhone with my existing SIM. If AT&T required a new SIM, why wouldn’t they be telling us that?
Well I don’t think they require it. But to get the best from the network an updated SIM should be used. If your happy with it then use the one you have.
 

Paco II

macrumors 68020
Sep 13, 2009
2,285
706
Well I don’t think they require it. But to get the best from the network an updated SIM should be used. If your happy with it then use the one you have.

Please provide support for that. What does it mean to ‘get the best from the network an updated SIM should be used’? What is that based on?

Edit to add: if someone provides factual info that a new AT&T sim is needed, cool, we’ll all get them. But all I’ve seen in the forum are lots of opinions that they are needed without anything to actually support it. And what I’ve been told by a tier 2 that seemed to know what they were doing is that a new sim wasn’t needed.
 
Last edited:
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ericwn

macrumors G3
Apr 24, 2016
9,118
6,639
Well I don’t think they require it. But to get the best from the network an updated SIM should be used. If your happy with it then use the one you have.

So it’s not required but to get “the best” out of 5G one should have it? What’s included in that 5G sim then?
 

FHoff

Contributor
Mar 21, 2020
420
912
Please provide support for that. What does it mean to ‘get the best from the network an updated SIM should be used’? What is that based on?

Edit to add: if someone provides factual info that a new AT&T sim is needed, cool, we’ll all get them. But all I’ve seen in the forum are lots of opinions that they are needed without anything to actually support it. And what I’ve been told by a tier 2 that seemed to know what they were doing is that a new sim wasn’t needed.

So it’s not required but to get “the best” out of 5G one should have it? What’s included in that 5G sim then?
Couldn’t find and official att statement
T-Mobile statement

While your current SIM card is 5G compatible, it is not capable of using the 5G standalone technology we recently rolled out.

Changing your SIM card will help to ensure you get more 5G in more places when using a compatible device, such as indoors and in rural locations, and will make sure you're ready to take advantage of future network enhancement.

Verizon statement

If SIM is activated asAnd inserted in this deviceThen
4G LTE5GDevice connects to the 5G Ultra Wideband network, but may not connect to the future enhanced 5G network
 

Paco II

macrumors 68020
Sep 13, 2009
2,285
706
Couldn’t find and official att statement
T-Mobile statement...

Ah yes, to support T-Mobile’s future “Standalone 5G” network. I think AT&T is lagging behind, and if and when they make a big push for SA5G we may see them indicate that a new SIM is needed.
 
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960design

macrumors 68040
Apr 17, 2012
3,287
1,147
Destin, FL
Ive always just pulled my old SIM and replaced it in my new phone but I got this email from apple stating the below:


“When you receive your new iPhone, get a new SIM card from your carrier to activate on your phone number or insert an activated SIM. We recommend using a new SIM to get the most up-to-date features.”

Does anyone know if there are new features?
We just use the eSim. Have not transferred physical sims in a while. Have not verified if eSim picks up 5G or not. Currently live in LTE land of yesteryear.
 

Cathyg

macrumors newbie
Nov 30, 2020
1
0
I set up my new IPhone 12 mini swapping with the sim from my iPhone 8. I am reading here that I did not need to do that (but due to COVID, could not get assistance of a tech), and may have less functionality using the old sim. I still have the sim that came with the new phone, and my carrier is AT&T. Should I try to reactivate or start over using the Sim from the iPhone 12?
 

yticolev

macrumors 6502
Sep 27, 2015
296
273
What's a little crazy is that my new iPhone Mini would not work with my existing Verizon sim card, but required 5G sim. However, my plan does not allow 5G service. Such silliness from Verizon, presumably to aid upselling more expensive 5G plans.
 
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