Actually, SMS does offer "guaranteed" delivery. It doesn't matter if the phone is off, an error occurs in communication, a data circuit goes down ... However there are limits. If the message cannot be delivered (such as end device failure) then you can request a receipt to get notification of this. I don't recall ever noticing a lag of hours for SMS delivery (I don't ever recall a TXT taking more than 60s to be delivered) but I guess different TXT processing systems use different methods for getting the TXT into the network for delivery. -----Original Message----- From: Jasper Bryant-Greene [mailto:j(a)digiweb.net.nz] Sent: Tuesday, 17 April 2007 11:15 a.m. To: Philip D'Ath Cc: Samuel Collinson; Dan Clark; NZ Network Operators Group Subject: Re: [nznog] Email to SMS gateway On this - we have found SMS to be a bit unreliable lately, with messages being delivered hours late or not at all. I am aware that SMS does not provide "guaranteed delivery" - what methods are others on this list using to send alerts reliably? Cheers Jasper