I have a device in Greece with a Vodafone Greece payg SIM. It uses sums to send to a UK number. Messages are delivered successfully, but with incorrect "From" numbers. Instead of the sender's +30 6xx xxx xxxx Greek number they arrive with +44 7xxx xxxx "From" numbers.
I set the "From:" field on outgoing messages (obvs.) but don't explicitly set "To:" or any other headers.
I'm sure this is a network issue and not an smsd or modem issue. But if anybody recognises this and has an idea of how to fix it then do please let me (& all of us) know!! Thanks
Operating system name and version: OpenWrt 19.07.8 (on GL.Inet GL-X750)
Version of smsd: Version 3.1.21
Smsd installed from: opkg
Name and model of a modem / phone: EP-06
Interface: embedded USB modem