I'm with shell, soon to be taken over by octopus. But I'm going today to buy another phone as the buttons on this one are now sometimes sticking and the outgoing message echoes. Time to bin this phone! I've had enough of it.
Thank you so much. Your help is appreciated.
That would indicate an issue with your phone provider, and not the phone. Perhaps its due to the changeover? Try contacting Shell and report an issue. Its probably a fault on the line, or their equipment.