topic Re: iphone 12 Pro - O2 Sim Battery drain in Pay Monthly

iphone 12 Pro - O2 Sim Battery drain

user43212 — Mon, 11 Jan 2021 19:19:58 GMT

I have recently purchased iphone 12 pro and am using it with the O2 Sim card. Unfortunately the battery drains almost by 25% overnight when the phone is idle.

I have replaced the phone already and did not make any difference.

If i remove the sim card the battery works fine, its only loses about 2 - 4 % overnight.

It is something to do with the Sim card.

Can you please advise.

thank you

Re: iphone 12 Pro - O2 Sim Battery drain

MI5 — Mon, 11 Jan 2021 20:21:26 GMT

@user43212

I assume that without a sim card it isn't connected to anything so it would be similar to being on airplane mode, hence the low battery drain.

You may have 5g enabled and not be in a 5g area which would mean the radio was working overtime constantly checking for a 5g signal, turn it off and see if it helps.

Re: iphone 12 Pro - O2 Sim Battery drain

user43212 — Tue, 12 Jan 2021 16:09:22 GMT

This issue is not resolved and the battery issue still remains, i have already tried all the battery saving tips from the internet.

Either there is something wrong with the iphone 12 or the 4g modems.

I am wondering if using esim will be any better.

Re: iphone 12 Pro - O2 Sim Battery drain

MI5 — Tue, 12 Jan 2021 16:09:49 GMT

Then I suggest you return it for repair or replacement.

You need to contact O2.
All numbers are in this guide
When you call, you will be asked for the reason you are calling.
Stay silent for 15 seconds and you will be taken to the keypad options.
Press 2 for Everything Else
Press 5 for More Options
Press 7 for Anything Else which will put you though to someone.
You can also try saying "Upgrade" or "Fraud" to be connected to an advisor.
8.00am is the best time to call if you can.

Re: iphone 12 Pro - O2 Sim Battery drain

user43212 — Tue, 12 Jan 2021 16:16:22 GMT

its been replaced twice already.

Re: iphone 12 Pro - O2 Sim Battery drain

MI5 — Tue, 12 Jan 2021 16:25:36 GMT

How many new sim cards have you had ?

Re: iphone 12 Pro - O2 Sim Battery drain

user43212 — Tue, 12 Jan 2021 16:35:50 GMT

I have not swapped any sim cards yet. I am using my original one from the old iphone.

This is something i am trying to understand is would swapping for a new sim or a esim help in anyway.

Re: iphone 12 Pro - O2 Sim Battery drain

MI5 — Tue, 12 Jan 2021 16:40:51 GMT

@user43212

You won't know unless you try.

Assuming you got a new 5g sim with the phone, do a sim swap to activate it and try it.

No one else has complained of excessive battery drain so it must be something with your sim or network settings.

Re: iphone 12 Pro - O2 Sim Battery drain

jonsie — Tue, 12 Jan 2021 16:44:08 GMT

Two replacements?

Odds on it's an app.

Re: iphone 12 Pro - O2 Sim Battery drain

user43212 — Tue, 12 Jan 2021 16:55:38 GMT

no I have been using the old 4g sim card on the iphone 12.

This issue is widely reported by a lot of users.

https://discussions.apple.com/thread/251956914?page=125

Several users have swapped their phone and the issue still remains. Which is why i am enquiring the mobile network.

Re: iphone 12 Pro - O2 Sim Battery drain

user43212 — Thu, 14 Jan 2021 11:15:28 GMT

I have now swapped to a esim on the iphone 12 and in terms of battery drain, it has not made any difference.

The only way i can stop the battery drain is the disable the sim card from settings.

Re: iphone 12 Pro - O2 Sim Battery drain

user43212 — Fri, 15 Jan 2021 18:50:05 GMT

So i bought a EE pay as you go sim and tried that on the phone.
The issue seems to have disappeared, the battery does not drain anymore.

I have read on various threads that users of Verizon, Vodaphone, O2 and three have these problems.

Its something on their network which is causing this.

Honestly right now it feels like i have a new phone. I was so fed up of trying to figure out the root cause of this.

Re: iphone 12 Pro - O2 Sim Battery drain

user43212 — Sat, 16 Jan 2021 12:39:47 GMT

I went and bought an EE Pay as you sim to try out on the iphone and I am really surprised to say that the battery drain has stopped.

On the 15th i was using the O2 sim card and you will notice that the battery was draining.

There is something on the O2 network which is causing this and would be really helpful if someone could respond and advise.

Re: iphone 12 Pro - O2 Sim Battery drain

jonsie — Sat, 16 Jan 2021 13:57:36 GMT

I'm very surprised so the question is, just what is the difference and why

Have you not altered any settings apart from the EE data set up?

Re: iphone 12 Pro - O2 Sim Battery drain

user43212 — Sat, 16 Jan 2021 14:40:17 GMT

Nothing is different, I got the phone restored from the icloud backup. Put my o2 sim card in.

Battery starts draining. Enabled all the battery saving features and it still does not make any difference.

Only thing that worked was to disable mobile sim.

So i removed the sim card from the phone and the battery draining stopped.

Then decided to get another pay as you go sim from EE and tried that. The issue has stopped.

There is nothing wrong with the iphone.

Re: iphone 12 Pro - O2 Sim Battery drain

user43212 — Sun, 17 Jan 2021 11:16:27 GMT

So it seems its either IOS 14 or the mobile network.

I switch to the O2 sim yesterday and again got the same result.

O2 SIM usage on the 17th

EE Sim Usage on the 16th

Re: iphone 12 Pro - O2 Sim Battery drain

VKV — Fri, 31 Jan 2025 18:14:39 GMT

Not true.

I have the same problem.

Re: iphone 12 Pro - O2 Sim Battery drain

VKV — Fri, 31 Jan 2025 18:18:01 GMT

I have complained as well but nothing happened.

Re: iphone 12 Pro - O2 Sim Battery drain

Oxonian — Fri, 31 Jan 2025 20:47:34 GMT

You have posted @VKV on a thread that was last live more than four years' ago.

If you have an issue, could I suggest that you go to the community homepage and start a new conversation ? You will need to explain your problem and indicate what help you are looking for. 👍

Re: iphone 12 Pro - O2 Sim Battery drain

madasaf1sh — Fri, 31 Jan 2025 21:35:12 GMT

@VKV

This is simple, and this looks like your phone is constantly hunting for an o2 mast as this has always been the case the more hunting for a mobile signal the quicker the battery drains..

I would suggest trying 4G rather than 5G as that may help..

Are the sims PAYG or Pay Monthly

Although to be faithful IOS 14 is now 4 versions out, and your phone will suffer from any optimisations as well as the fact that IOS14 is out of support and has security vulnerabilities..