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It is not possible to unlock region codes. Most DVD (blue ray players) allow you to change the region code you can play, once. You can't even switch back to the original code it was set when you bought it.
If you really want to play disks, the only way to get around this, to rip the disc on a computer, and burn it on the computer, region free. For that you need special program m's, but in some countries you can get these programs for free.
Or buy several players, each set to a different region.
The problem with Amazon DVDs purchased is the region codes each disc may contain. Since a majority of them would be from USA, and their region is 1, your player being region 4 would not support that code.
There is no fault here, it is just a restriction. Some discs work, some don't.
No one likes region restrictions - particularly on DVDs bought legally, and I doubt very much Panasonic would provide any information on unlock codes for you.
Be warned: if you do successfully find a hack to unlock your player so it becomes region-less, expect the risk of either the player failing later, or not reading any discs at all. I am sure there are 'region-free' players around now, which don't contain a restriction and can play ANY DVD any region.
On the other hand, if you have a DVD drive on your PC, and it is set to
region 0 or all regions, and the discs play fine in it, but not the player, then you could view those particular discs that way; you do not need to make any copies of any of the DVDs just to watch them.
make sure to use lens cleaner to ensure DVD player is free of dust and dirt on laser lens
another cause would be that your DVD player is no multi-region or not region free, because many DVDs have region settings. in order to make your philips DVD player region free (can play all region DVDs) check link below:
The screen will show: "Region Code: 2" Press [1-6] to manually set the region OR  for multi-region.
Press [SETUP] to exit
You will now be able to play DVDs from anywhere in the world.
This is particularly useful, because region 1 DVDs from the US often come out when the movies are still in the cinemas over here. Region 1 DVDs can be bought perfectly legally by mail order or from the internet.
check the region code of the dvd that u bought...if its not according to your country region code then the dvd would play only in laptops and pc dvd drives..u can contact the service station of philips and ask them to unlock ur dvd player so dat it becomes region free..i had the same issue with my dvd player
This is for DVP31XXX series i hope it works all on DVP31 series. It has been tested on DVP3146K /51 and it has been worked...
1. Make sure there is no disc in the player. 2. Turn power off and on again. 3. Open the tray. 4. On the remote, hit 9879 and then 0. This changes unit to Region 0, meaning it'll play all regions. 5. Hit OK on the remote.