Cannot hear anything on samsung gusto phone

SOURCE: samsung gleam

This is a software problem. Remove and re-insert the battery which resets the microphone. Samsung does not have other solutions.
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SOURCE: no call volume om samsung e250

This because in your handset there will be 2 speakers
1 is loud speaker and 2 nd one is ear piece speaker....

so the loud speaker is working fine ...
There may be some loose contact in the ear piece speaker or the speaker might have got damaged ...

so if you are good at opening then just open your handset and check if there is any loose contact in the ear piece speaker .. is so fit it correctly ..
or you replace the ear piece speaker with the new one ...

if you are not good at opening then just contact the technician ...
he will do it ...
The ear piece speaker is very cheap so no problem .. just buy the ear piece speaker which is compatible to your handset in the shop if you are doing it by your self ...

the technician might take the service charge for this that s all but the ear piece speaker is too much cheap ..

any doubts reply me
i am always here to assist you
thank you
bye ...

SOURCE: when i call someone or they call me i can t hear them

Your Internal speakers are on their way out, send the phone into its manufactorer, and they will mail you a brand new one.

SOURCE: I can't hear anyone, nor can i be heard, when making or receiving calls

Sometimes there might just be lint or something in the headset port. Try taking some canned air and blow it out or take a headset and plug it in and out a few times.

SOURCE: I cant hear anyone talking on my iphone

This sounds like the earpiece has gone, you should be able to hear them if you put it on loud speaker or if you are using bluetooth. However as it is only 5 months old it is covered under warranty so my advice would be to take it back to where you bought it or contact apple direct. They will repair it for you however you will be without a phone for a number of weeks