3 ms·

I don't think there was any SMS on 1G cellular, which was purely analog.

• parker_mountain 4y ago
  Some early mobile networks, especially those that had out of band signalling like some of the early euro specific ones, supported short messaging as a first class feature. However, aside from attaching a modem to your cell phone, it was not widely adopted until GSM and digital based protocols took over (2G)