Connected via AT&T iot sim stopped working

[irfan5911]

Using Gpy with expansion board 3. I was able to setup and connect using AT&T iot sim using:

# While the configuration of the CGDCONT register survives resets,
# the other configurations don't. So just set them all up every time.
print("Configuring LTE ", end='')
lte.send_at_cmd('AT+CGDCONT=1,"IP","m2m.com.attz"')
print(".", end='')
lte.send_at_cmd('AT!="RRC::addscanfreq band=17 dl-earfcn=5780"')
print(".", end='')
lte.send_at_cmd('AT+CFUN=1')
print(" OK")

Then registered the device through pybytes and did an integration azure.
Now the device does not connect. re installed firmware for modem and gpy.

Any suggestions?

[irfan5911]

@irfan5911 figured it out. correct band and earfcn are crucial.