EM7355 where to buy new ?
This module has been end of life
probably you need to buy it in 2nd hand market.
I inquired about new modem only because of my recent experiences with second hand : AT&T will accept only one that came from a computer that had been sold by AT&T, as revealed by lookup of the IMEI number. A couple sellers describe their modems as being only for Verizon; another only for Panasonic. All others unknown.
I feel stuck.
I have no idea then as it has been end of life