During GSM initialization high current spikes may be required (up to 2A).
If battery is already discharged (30% for 480mAh), GSM will not send "Call Ready" message after initialization is complete. This blocks GSM firmware to complete device initialization and thus device does not proceed to active mode.
Need to investigate if it is OK to proceed GSM initialization even if "Call Ready" was not received.
During GSM initialization high current spikes may be required (up to 2A). If battery is already discharged (30% for 480mAh), GSM will not send "Call Ready" message after initialization is complete. This blocks GSM firmware to complete device initialization and thus device does not proceed to active mode.
Need to investigate if it is OK to proceed GSM initialization even if "Call Ready" was not received.