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First of all clean the pores of the earpiece just in case there is block on the passage of sound fromt he earpiece speaker.
If this wont improve then the speaker must be changed after confirmation with a new one.
HI, when a cell phone has Low sound for top loud speaker and earpiece when calling , it is when the loud speaker and the earpiece are weak to perform accurately and will need to be replace for better sound quality for your cell phone.
When a phone drops on the flow or water gets into it,might cause the hearing of the lod speaker sound to go weaker and weaker every time.
When you replace the ear piece and the speaker, you phone will work perfectly again.
If when you replace the speaker and soundisstillthe same , that means it's an IC chip problem inside the cell phone . An expert will help you on that.
Change your earpiece.Need to know in phone have 3 kind of mic:1,microphone to make somebody hear our voice. 2.Ear piece to make we can hear for sombody voice. 3..Buzer to make phone ringing or louder sound when somebody speak (speaker). in that case your earpiece is not work,so change your ear pice. I hope it help.
Sounds to me like you might have a loose connection or broken wire to the speaker on the earpiece. It MIGHT be fixable dependent on your skills with a soldering iron however I've found through experience that most often times these fixes don't last and you'd be better of replacing anyways.
If you feel comfortable with trying you could open the case up until you get to the component level and see if you can find the faulty wire. I would imagine that it would be either where it connects to the speaker or to the main board. I wouldn't hold out much hope of repairing it though.
I got my i870 from my sister a week ago, i got it for boost mobile but the ear speaker doesnt work either, i took it apart and i ordered the flip part of the phone which comes with the whole top section. It should work after i put the new part. it was only $26 off of ebay. the parts were only held up five screws. really easy but you have to be careful and gentle.
just remove the cover and check the speaker volume.. may be some new plastic coating an the new cover will be blocking the sound from coming outside properly.
If it is not the case then please do come back
all the best