Currently the Telit modem implements modem_after_sim_unlock() with 1s timeout, however the #QSS URC management (introduced later) waits for QSS=1 URC in csim_unlock_periodic_check up to 3s, which makes this 1s delay not necessary anymore. see also: https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/issues/3