After typing that, I just realised the significance - it's the first five keys of the bottom row of a "qwerty" keyboard. But anyway.
I was quite puzzled by that text. I got it immediately after sending a text to a friend who it was costing me money to text, and, with a low prepaid balance and fearing that this was an alternative to Vodafone's traditional "Sorry, you do not have enough credit to send this message" response, I checked my balance. But I still had enough money to send texts. So I showed the text to my friends and we laughed about it, trying to pronounce the word in an urgent manner. Zxcvb! ZXCVB!
But then just after lunchtime on Monday (12:54:36pm, 12/04/2010), I got another text from Vodafone:
Due to a system error you were sent a VF TXT on 12April10 that said 'ZXCVB'. Please ignore this message. Our apologies for any inconvenience caused.
Well Vodafone, I refuse to ignore that message. It amuses me too much to do so. But rest assured that no inconvenience was caused at all - in fact, it was a source of much entertainment.
I found out later that one of my other friends also received this puzzling sequence of messages from Vodafone. What a mystery.