I first received this error repeatedly the same month as jimbo - May 2011. My experience was similar - it just kept on coming! I thought it might have something to do with the fact that the phone was brand new, and this was happening within the first 24 hours of use (using an existing SIM). After trying the measures mentioned above, it still continued, but then after a few days, it just stopped, for no apparent reason.
Now - 15 months later, I've started receiving it again, on the same phone, several times a day, always showing the same sending time, and from a sender whose name consists of graphics symbols.
When I try checking my PAYG balance in the usual way by sending the word 'Balance' to 450, instead of receiving balance details, I get the 'Update Error: 050730 text.This has been happening for three or four days now. I have a good, strong, Orange signal.
I've started wondering if some, all, or any normal texts being sent to me are also being replaced by this Update Error text, especially as someone yesterday was certain they'd told me something, but I hadn't received it. I've sent myself a text from the phone and this was received normally.
I've tried deleting it every time I receive it, of course, and turning the phone off for a while, and on again, but still the Update Error texts arrive.
Has anyone else been experiencing this problem recently? Any ideas how to sort it?
Rob
August 2012