On my Prestigio MultiPhone 3450 camera cannot connect message appears when I want to turn on the camera. How to fix it?

See manual here:
http://www.manualslib.com/manual/660817/Prestigio-Multiphone-5300-Duo.html?page=13#manual

Move your apps to the SD card via Settings - Apps. You have to move each app one at a time, and some will not move. Then clear your browser cache. Delete old messages, especially ones with photos and videos with them.

Hi
The link below takes you to a page from which you can download the manual.
http://www.manualslib.com/download/660817/Prestigio-Multiphone-5300-Duo.html
I can appreciate your frustration as the Prestigio site appears to have nearly all manuals except this one !!
Good luck.

menu-sounds-
you can find touch sound as well keypad tone.

How to operate camera on Prestigio 3502 DUO

I attach a picture with the solution because I think the solution is clearer this way. You should be able to chose the prediction mode.

as daft as it sound sometime wifi can be to strongif you are too neer the wifi - try re-setting the router turn in on / off and try again, or factory reset the photo or go to the prestigio website as there maybe a firmware for the phone - i know they do support the phone to a resonable level

Internet & MMS settings can only be sent by your network provider,( not the manufacturer) usually by way of a text message which will then setup automatically, contact support for your network who will be able to provide you with the advice you need,

when in camera mode it should show a little camera icon with a arrow turned around it tap this and it should switch if not it's in settings.