Do I need to, and if so how, do i upgrade from a 4G to 5G sim

[guymanchester]

I currently have a pay as you go 4G sim in my iPhone 11 Pro. I will soon be upgrading to an iPhone 12 pro with 5G. Do I need to update my sim from 4G to 5G and what is the process?

[MI5 · Accepted solution]

@guymanchester 

Yes, you will need a 5g sim. Any O2 store will swap your sim for free.

[guymanchester]

Thank you for your quick reply

[MI5]

You're welcome

[Woody53]

I am looking to get a second family SIM on my contract. Initially it will be used in an iPhone SE (early version), which is a 4G phone. However that SE will be replaced with an iPhone 12 Mini in November, which is a 5G phone.

Should I ask for a 5G iPhone SIM, if so will it work OK in a non 5G iPhone? Or should I ask for a 4G SIM and swap it once the phone arrives?

I really do not understand why O2 have iPhone specific SIMs and further complicate matters with 4G and 5G SIMs!

[Cleoriff]

@Woody53 

A 5G sim will work in a 4G phone but you will only ever get 4G.

All O2 sims are now 5G capable but will only give you 5G if you are using a 5G phone and are in a 5G area.

You will have no problem using the sim in either phone if you remember what I have posted above

[MI5]

@Woody53 There are no specific iPhone sims.

Pnly different account bolt ons.

Any O2 sim will work in any phone but without the iPhone bolt on, some specific iPhone features won't work. And yes, it is a nonsense as it's not required by any other network.

[AmyBye]

Will my 4G sim work in an iPhone 15 Pro? 

[jonsie]

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@AmyBye wrote:

Will my 4G sim work in an iPhone 15 Pro? 

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Yes it will