Phone fault? Any ideas?

I have an old mobile phone (Ericsson T28s). Yesterday my wife phone me
on it and I couldn't hear her.

It appears that any call made by this phone results in the caller not
being heard.

My immediate conclusion is a microphone fault. However when I speak
into the phone I can hear the sound coming back in the earpiece.

Second conclusion is a fault between microphone and modulator in the
phone so sound is reaching earphone but not affecting radio waves

BUT the sound I hear in the earpiece has a slight delay in it. So I am
thinking the sound must be reaching the network and being re-broadcast
back to me.

So how come the speech can't be heard by someone being called?
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Graham Cluer | Email: news1 <at> cluer <dot> com

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It might be some fault with network at that time.