Unfortunately you can't actually tell whether someone opened an sms - the only information we receive is whether the handset received it. The unreachable numbers count reflects this number. This happens when either the number is disconnected or unused or the phone has been switched off for 2-3 days. It's distinct from the recipient responding to the message and explicitly telling us that we have the wrong number - these situations are reflected in the 'wrong number' count.
This all said, if a message makes it to the handset, this is almost tantamount to someone seeing the message.
We haven't done our own private research, but it would stand to reason that the common sms marketing stats that claim '98% of all sms are read' have merit. Since the sms usually gets flashed on the phone's lock screen, and is so short that at least the 1st 80 characters or so is shown in the received sms listing, it is very hard for the recipient to not read it.
Open rates are important for an email campaign, as it indicates whether people move past the subject listing to actually engage with the body. However they're less relevant for sms campaigns, as most of the body is contained in the 'subject' ; i.e. in the sms browser's listing.
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