I change my phone and it is asking for unlock PIN. I tried the PUK but it is not working

Is you S5 unlock ? Can he support the fizz network ?

You can get more help if you contact Fizz on messenger.

yes, my S5 is unlocked.
I'm waiting on messenger since 3 hours now.

Are you sure that the S5 is unlocked, because that sort of message sounds like it is locked to a previous provider.

yes, I'm sure. I bought it used and unlocked. and I was using it with Chater.

also, it is asking to enter the PIN to unlock the SIM

Using the phone on chatr might have locked it to that network. If possible, try your Fizz sim in another unlocked phone to confirm. The message on Samsung phones has caused more than one person to end up entering the wrong unlock code too many times and locking up the phone even more.

It sounds like your S5 is locked. You stated that your SIM worked on your S6 so we know that there is no problem with the Fizz SIM card. You can try using a Bell, Telus, Virgin, Koodo SIM to confirm it is locked to Chatr if you see the same message.

Keep in mind chat-r is a Rogers subsidiaries, so it's possible that a Rogers/Fido phone would work fine on other subsidiaries of the same network, can't you contact the original carrier and ask them for an unlock code? It should be free now.

How many times did you tried the Fizz Puk code? If you enter the incorrect PUK code 10 times, your SIM card will be permanently blocked. You will need to order a new SIM card. https://fizz.ca/en/faq/how-do-i-use-puk-code-to-unblock-my-sim-card