SMS undeliverable on O2 UK Pay As You Go (PAYG)

Lately, international sms sent via O2 PAYG have failed for no apparent reason.

After composing each text messages and pressing the send button, immedeately a notification from O2 is received stating "Message 23xxxxxxx88 to 65xxxxxxxx45, cannot be delivered." It's as if there wasn't even an attempt to send the sms by O2 in the first place. The receipient number is valid and previous sms sent to the same number were succesful and without a hassle.

What's frustrating is that each failed sms were still charged! Haven't complained yet, but if situation persists, I'm gonna.

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