In order to send SMSs, my service provider says I need to set the SMS "service centre". In Android, it's apparently on option underneath messages-->settings, but I don't see where to set it on Ubuntu Touch. Under mobile-->carrier, there are only two options which can be manually set: Internet APN and MMS APN. I had to set the internet APN manually in order to get mobile data. But the SMS service centre is a phone number that needs to be set rather than a DNS name like the APN options.
Anyone else run into this issue?