Have you change a new PA(power amp)or any hardware part on your Nokia N73 cellphone? You could try a factory restore on the handset. If this fails you would need to book it in to your nearest Nokia Repair centre for it to have a firmware update. or Try to flash your firmware to the newest version. Most likely Network problem I had similar problem with my N70 once but then once I got out of that place it worked fine.
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