Alba F28 UK when I make call person at other end cannot hear me. How do I correct this.

SOURCE: sony ericsson Z520

I had the same problem with that phone... while manipulating the mobile part (cover) you can slightly improve the volume.
Another point to check is the button on the side of the phone which allows to increase or lower the volume: it could happen that you turn the volume low without noticing it...
My solution was to replace the phone.

SOURCE: Volume control

the ear piece may be dead or if its a flip phone check the flex cable

SOURCE: cant hear person on other end of phone

check the ear speaker and replace it with new one..

SOURCE: Samsung T629 I can't hear the person on the other end of call

The problem could be due to some contact error in the headphone jack of ur phone. Please re insert the headphone and remove it. Now try making a call with the speaker volume put to maximum. Dont forget to rate the solution. Thank You..

SOURCE: My phones rings I cannot hear the person calling

Its related to your phone volume..try to increase it using arrow keys upside...or it also be a connectivity issue from the operator.