Plain text on web interface

By the way, Sir Anton… apologies for going a bit off-topic but I would just like to know:
does playSMS really require us to use kannel (or anything similar) to be able to detect my USB modem to send and receive text messages? Basically, I would like to use the full functionality of playSMS using our GSM carrier’s sim-card through a USB modem. Is there a guide/tutorial for doing that? Thank you for your assistance Sir.

ZTE gsm usb-modem