Sim card not working in my phone

[farmerjosh3]

i have a asus zenfone max plus i just got a couple weeks ago and i have been on public mobile since i got the phone now the phone updated to android 8.1 from 7 now i have no connection at all and if i put the public mobile sim card in my android 7 phone and it works fine what can i do? @CS_Agent

[will13am]

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@farmerjosh3 wrote:

do you know how i can revert to android 7 that this phone came with because the sim worked fine with android 7

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I don't think you can revert backwards on an OS update.  If you could, then Asus did a bad job.  Rolling back updates is the oldest trick in the book to exploit security holes.  I find it hard to believe that an OS update can make a phone lose compatibility with a cell network.  Failing to install and bootlooping is one thing, but completing the update and then breaking the phone seems really odd.

At this point, I suggest giving lineage OS a try.  There is nothing to lose  If the zenfone in question is model X00TD, then there is official lineage support.  Version 15.1 is android 8.1. 

https://download.lineageos.org/X00TD

[Anonymous]

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@farmerjosh3 wrote:

do you know how i can revert to android 7 that this phone came with because the sim worked fine with android 7

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This is one version. I'm not endorsing it or anything. Heck I don't even have an Android phone. It looks pretty complicated. Sorta like LineageOS maybe.

Maybe only a little more complicated than that redflagdeals link instructions.

How'd it go with the lost/stolen?

[farmerjosh3]

do you know how i can revert to android 7 that this phone came with because the sim worked fine with android 7

[farmerjosh3]

oh okay maybe

[Anonymous]

About LineageOS...it might be that your phone isn't compatible.

[farmerjosh3]

ok ill try that first

[Anonymous]

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@farmerjosh3 wrote:

i contacted asus support  and they got me to factory reset it and it still wasnt fixed

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Right. It's a known 8.1 problem.

Just for giggles:

Try the lost/stolen feature.
Log in to self-serve. Plan & Add-Ons from top menu. Lost/Stolen Phone from next menu. Suspend Service button. Log out. Wait a few minutes. Log back in and back to Lost/Stolen Phone and Resume Service this time. Log out. Restart phone.
See what happens.

[farmerjosh3]

i contacted asus support  and they got me to factory reset it and it still wasnt fixed

[Anonymous]

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@farmerjosh3 wrote:

what does that software do anyways?

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The redflagdeals solution that RobertQc also linked to was the other more technical possibility.

But again, have you restarted the phone? Maybe also the lost/stolen trick might fix those bars.

[farmerjosh3]

what does that software do anyways?

[farmerjosh3]

yeah so after the update happend then all my signal bars went away then it flashes on and off and i can't do anything

[RobertQc]

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@farmerjosh3 wrote:

ok thanks i was wanting to go back to android 7 but they said i can't when i contacted asus tech

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@farmerjosh3You can, most definitly downgrade. (By doing a clean and fresh install of a v7 rom)

I would however, if it was me- install LineageOS instead.  I refuse to buy a phone that does not support LineageOS.

If you have some free time and feel up to it, do it here https://wiki.lineageos.org/devices/X00TD or https://forum.xda-developers.com/asus-zenfone-max/development/llineage-os-8-0-asus-zenfone-max-z010d...

Make sure to confirm your exact model and to follow the instructions to a T.

[farmerjosh3]

ok thanks i was wanting to go back to android 7 but they said i can't when i contacted asus tech

[Anonymous]

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@farmerjosh3 wrote:

oh okay i think ill go try a different company because i need my phone for work

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Have you rebooted the phone?

Does voice work? Text? Data? Any? Some? Account active? Suspended?

Yes this a known issue for data things but one possible work around is to insert another SIM and set up the APN.

There is another possible rather more technical solution as well.

[RobertQc]

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@farmerjosh3 wrote:

i have a asus zenfone max plus i just got a couple weeks ago and i have been on public mobile since i got the phone now the phone updated to android 8.1 from 7 now i have no connection at all and if i put the public mobile sim card in my android 7 phone and it works fine what can i do? @CS_Agent

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@farmerjosh3This is common, if you don't feel like putting lineageOS on your max, or downgrading back to 7, read this https://forums.redflagdeals.com/solved-fido-apn-miui-10-cant-add-apn-2239645/#p30122708

@farmerjosh3 wrote:

oh okay i think ill go try a different company because i need my phone for work

 @farmerjosh3 This is not public mobile, this is a problem that can happen across all carriers with 8.1

[farmerjosh3]

oh okay i think ill go try a different company because i need my phone for work

[Carld123]

@farmerjosh3

Looks like its an issue with the 8.1..other members have been experiencing the same issues