Is anybody here successfully using connman+ofono with Telit he910 modem?

Seems like connman using .set_online interface in ofono_modem_driver,
I've added set_online_ to he910 plugin. And everything works fine.
Except after set offline/set online sequence I can't activate gprs
context anymore.
Here is log:
Jan  9 14:32:51 yarus-ng daemon.info ofonod[138]: Modem: >
AT+CGDATA="PPP",1\r
Jan  9 14:32:51 yarus-ng daemon.info ofonod[138]: Modem: <
AT+CGDATA="PPP",1\r\r\nNO CARRIER\r\n
Jan  9 14:32:51 yarus-ng daemon.debug ofonod[138]:
drivers/atmodem/gprs-context.c:at_cgdata_cb() ok 0
Jan  9 14:32:51 yarus-ng daemon.info ofonod[138]: Unable to enter data state
Jan  9 14:32:51 yarus-ng daemon.debug ofonod[138]:
src/gprs.c:pri_activate_callback() 0x149318
Jan  9 14:32:51 yarus-ng daemon.debug ofonod[138]:
src/gprs.c:pri_activate_callback() Activating context failed with error:
Unknown error type
Jan  9 14:32:51 yarus-ng daemon.debug connmand[135]:
plugins/ofono.c:set_property_reply() /he910_0 path /he910_0/context1
org.ofono.ConnectionContext.Active
Jan  9 14:32:51 yarus-ng daemon.err connmand[135]: Failed to change
property: /he910_0/context1 org.ofono.ConnectionContext.Active:
org.ofono.Error.Failed Operation failed

AT+CREG? and AT+CGREG? normal answers
so modem registered in network and gprs context attached AT+CGATT=1...

What causes NO CARRIER answer of modem?

If necessary I can provide full log of connman/ofono...

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Best regards, Mednyy Alexey.