Configuring Verizon SIMs in MC7750 or MC7354 Embedded Modem

Setup procedure when configuring theMC7750 or MC7354 Embedded modem:

MC7354:
Use APN: vzwinternet and

MC7750
APN: [leave the field blank]
Phone Num: *99***3#
The *99***3# (profile #3) has correct APN. Also, never put anything in the APN field in conf UI, it must be blank.

If you save any text in the APN, you need to restore the original default APN settings by this procedure:

  1. Go to the Config UI of that MC7750
  2. Delete APN field
  3. Input AT+CGDCONT=1,"IPV6","vzwims" in [AT cmd 1] field
  4. Press "Save"
  5. Press "Connect" (or "reconnect")
  6. Wait a several seconds
  7. Press "Abort" or "Terminate"
  8. Go to Config UI of MC7750
  9. Delete the contents of the AT cmd 1 field
  10. Add Phone Number: *99***3#
Also, if MC7750 sticks to US Cellular band, you may want to set BAND
to LTE in Sierra config UI temporarily. After MC7750 is registered to
LTE signal, you could reset it to "ALL".

Note that MC7750 often switches the S/N, it has two S/N and sometimes switches from a regular S/N to an all-hexadecimal number. In that case, the configuration sometimes must be done 2 times, once for each S/N.