5G SIM in a 4G Iphone 11 Pro Max

[ASA1]

Hello eceryone.  Yesterday I started a new pay monthly contract with unlimited data.  I'm using a new 5G O2 sim in a 4G apple iphone 11.  It seams to be working fine but O2 told me that I should, have a 4G SIM until I decide to get a 5G device because the SIM might not work propley?  What dose this mean as it is working great.

[MI5 · Accepted solution]

@ASA1 

It will work fine, there's no need for a 4g sim at all.

[ASA1]

Thank you for your reply.  Why the hell have O2 customer service told me its best to have a 4G SIM?

[MI5]

Because they rarely know what they are talking about @ASA1 

Their crib sheet will say the phone is 4g so they assume that you need a 4g sim.

[ASA1]

So the 5G SIM will be OK?  Would a 4G SIM work better in a 4G device or is there no difference?

[Cleoriff]

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@ASA1 wrote:

So the 5G SIM will be OK?  Would a 4G SIM work better in a 4G device or is there no difference?

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The 5 G sim will be fine. |You will probably ony get 4G, but it will work OK.

[MI5]

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@ASA1 wrote:

So the 5G SIM will be OK?  Would a 4G SIM work better in a 4G device or is there no difference?

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As I said, it will work fine, there's no need for a 4g sim in your phone at all.

There's no difference as all sims are backwards compatible.

[jonsie]

Weekend staff innit...

[MI5]

Trouble is, they work all week too !