What should I do about seeing the unknown parts message ?

If you had the screen on your iPhone replaced by ANYONE other than Apple or an actual Apple Authorized Service Provider (such as BestBuy in the US), there is nothing you can do about the unknown part notification. And that would be because you don't have an authentic screen on your iPhone. Apple will not touch an iPhone which has been tampered with by anyone. It won't be accepted in trade to Apple, and you'll have to disclose to anyone you might ever want to sell the phone to that it doesn't have an authentic Apple Screen.

Either your iPhone's display has been replaced by an unauthorized service center, or it has failed in such as way that your iPhone cannot verify that it is genuine.

If you have had your display replaced and you see this message, you need to go back to whomever replaced your display and tell them to do it correctly.

If you have not had your display replaced, then you should visit an Apple Store or authorized service center to explore your options. See iPhone Screen Repair & Replacement - Apple Support

There is NOTHING you can about the message. If you are having an issue, take it back to whoever you paid to replace parts in it. Apple won't touch your phone. Having unauthorized parts installed in your phone, was a bad decision. The phone is pretty much worthless now.

So what I should do about the non genuine apple part that showing on my phone?

There is nothing that you can do about this.

my maximum battery capacity is only 74% my phone is 11pro iphone

The battery needs to be replaced. You can try to have an authorized Apple service shop install a new battery, but they will likely refuse to work on the phone since it has been tampered with.

You can find a list of authorized shops in your area using the link just below:

Find Locations

If an authorized shop will not work on the phone, all that you can do is have a non-authorized shop install a non-authorized battery and hope for the best.

We can't speak for whoever you purchased the phone from and the parts they used. When you buy either a brand new iPhone or a refurbished iPhone directly from Apple, you will be assured it is certified by Apple to contain only authentic parts. You're best bet if you want to continue to use your iPhone is to take it to a 3rd party shop, but they will have access to 3rd party parts, not authentic Apple parts.

I'd return that phone for refund.

Return it to whoever you bought it from for a refund.

Go buy a new phone from an authorized retailer or directly from Apple.

That's between you and whoever you bought the phone from.

Next time, stick to authorized retailers.

Will the unknown part mess up my cellular network connection

matika192 wrote:

Will the unknown part mess up my cellular network connection

That’s impossible for anyone to predict. What id does is render your phone unsupportable here and untouchable by Apple.