You need Audacious APN settings on your phone to ensure you can connect to the mobile internet network and send picture messages.
When you insert a new Audacious SIM into your phone, you may get offered a choice of mobile operators but don’t worry you can select any from the list, they are all the same settings and will appear as ‘everywhere’ under your APN.
For iPhone: go to Settings, Mobile Data / Cellular Data, Mobile Data Network
For Android: go to Settings, Mobile Networks, Access Point Names
For Windows: go to Settings, Mobile Network, Add APN
Enter the following settings for internet: