The problem is that, when she has completed writing a text message and hits the "send" button, a message comes up saying "could not send". So, a minute or so later, she hits "send" again and the message goes through straight away.
Now, the recipient of the text message receives the SECOND attempt straight away. But, here's the strange thing, about 24 hours later, the recipient receives the same message again, which is in fact the FIRST attempt at sending the message.
A Vodafone shop has inspected the phone's SIM card and advised the owner that the SIM card is working satisfactorily. Vodafone advised her to have the phone serviced by Sony as they consider that the fault is not caused by a problem with the Vodafone network.
Can you please advise us whether you think this is a Vodafone network fault or a phone fault. Have any Vodafone users experienced similar difficulties with sending text messages? Any advice on how to solve this problem would be appreciated.
Thanks very much for your help.