Send multiple SMS simultaneously using Multiplex?

I think it is in the nature of the Short Message Service (SMS) that each message has only a single destination?

To send to multiple recipients you will have to

• either: have your application send them individually
• or: use a “Bulk SMS” service

Not the HL series - you need the WP series for that:

sierrawireless.com/products … t-modules/

Again, you need an WP series module