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You need a new earpiece. They are very cheap on Ebay and no soldering is required. Checkout how to take K800i apart on something like YouTube. It is only 4 T6 torx screws and 2 philips screws. Take the front cover off and the earpiece can be pulled out of the front case (it has 2 gold spring contacts) as it is glued in and replace with the new one. The gold springs contact the phone PCB when you reassemble the case
but you'll need to back up all your data to your removable memory card first.
remove the sim card and the memory card, power up your phone,
GO to Menu
then TOOLs or Setting
the Master reset (default security code is 0000 or 00000 unless you changed it
then after the setting completed try your phone..
now if ever it does'nt work then you''ll need a technician to check your BUZZER not the speaker but the BUZZER, it is the same as the speacker but it's main function is for ypour tones(ex. alert tones, ringing tones, music and etc)
I've had my phone for close on 2 yrs now so I know it quite well. Simple (and obvious) way to test if the phone rings is to ring it from a land line and listen out for the ring tone. Maybe you are not clearly hearing the ring tone from all the other noise around you- try some other ring tones that have varying notes. I downloaded some of songs I like. I found that makes it easier to hear. Don't go for rap music- I found that was the most difficult to hear. I've managed to transfer an mp3 song from my computer onto my phone and use it as a ringtone.
Another way to test the speakers is to play some music through the "entertainment" menu. That way you can test to see if the volume adjustment is working well. If you can only hear the music faintly (as well as all other sounds), then there is probably something wrong with the speaker.
Yes, mine has a green light that flashes occasionally. I think that is the phone checking the signal.