I've got my wife's old i-phone 4 (she has upgraded)

and until the other day I was getting a click sound every time I pressed a letter to send a text, but now that has stopped

also when I send / receive texts no sound comes out... I checked under settings / sounds and there are sounds there but nothing comes out of the i-phone

I've also just tried to play a song from my playlist and no sound is coming out..... have I done something wrong or is the speaker stuffed in the i-phone?

Is there something I can try to get it working??

I'm an i-phone novice so any help would be appreciated!