Samsung Galaxy Y: Fix Not Registered on Network Error - Automatic Network Detection Issues

If it's a new card, remove the card and turn on the phone again. After that, switch off, insert the card and turn on the phone again. You should get automatic settings on the phone via SMS. If not, you can set it by going to the operator's website and sending the settings to yourself, or by entering them yourself. If it still does not work, you either have a simlock or the card is not paid or you are in the roaming area where the operator has no signed contract.

What operator?
What specific model?
You are in Poland?

Well, it's probably a theft lock ...

Do you have the correct imei? Do you have a new phone, or did you buy it from someone or at an auction?

It may be, as a colleague wrote above - stolen - and the operator blocked it.
Imei check and compare with sticker * # 06 #

When he calls 112, it must be stolen and blocked.

regut12 wrote:

... And besides, there shouldn't be stolen phones in the pawnshop ...

You're right - it shouldn't be. ...

But I suspect they are. Give it back as you can.
... And by the way, it's strange that you didn't check if it worked when you bought it

Did you buy it with a box or in bulk?

in my opinion it is the same as in the case of samsung galaxy s3
a colleague was playing with softami or the modem driver trying to improve the coverage in the phone.
You can't go back too much of the software version, especially the modem driver, because later the new "Not registered in the network" problem occurs.
In my case, in sgs3 it was enough to install a warped modem.
(why did I get the message "Not registered in the network"? For the fact that I had a newer modem and I wanted to improve the range at the expense of the battery - I read the stupidity from the net that the DLID1 modem is great that it does not tear the net and hsdpa has so many dashes that no one is there He did not write that you should have an older modem in the phone than DLID1 and I had a newer one and I uploaded an older one and the problem that the phone became like a tablet without GSM. After uploading the stored modem, the problem disappeared as the hand went away ... sure to go on sites only move your head ...
If someone found this post with the same problem with the galaxy S3 phone, he gives a link
http://forum.android.com.pl/f28/problemy-podc...4-1-2-i-4-2-2-nie-zarearzenia-w-sieci-333406/ if you have andka 4.1.2 then install only from point 2.
In galaxy Y I would be looking for a similar solution.