Recently my phone seems to have developed what can only be described as a squeal immediately after dialing a number. This squeal is so loud that I simply have to cut off the call before speaking. The squeal itself does not appear to be intermittent, it is just a continuous, loud, high pitched squeal. Although, I have never been able to keep the call on long enough to discover whether it will go. I also think this only occurs when I have a low signal as a couple times my call has resulted in a call failed. Any ideas as to what this could be and how it can be fixed? At the moment I have a phone which cannot make a phone call. I should also point out that this problem doesn't always occur. I just cannot work out what sets it off. I have tried making the call with 3G and data turned off both of which had the same results.