1. "No Signal" does not show up in the indicator bar until WiFi is
switched on

2. When this started happening the maximum amount I've waited is around
10minutes, no signal

it seems like the modem is not there until WiFi is enabled. For example;

WiFi enabled:

root@ubuntu-phablet:/# /usr/share/ofono/scripts/scan-for-operators 
Scanning operators on modem /ril_0...
[ /ril_0/operator/24412 ]
    Status = available
    Technologies = gsm 
    MobileNetworkCode = 12
    Name = dna
    MobileCountryCode = 244

[ /ril_0/operator/24405 ]
    Status = forbidden
    Technologies = gsm 
    MobileNetworkCode = 05
    Name = FI elisa
    MobileCountryCode = 244

[ /ril_0/operator/24491 ]
    Status = forbidden
    Technologies = gsm 
    MobileNetworkCode = 91
    Name = FI SONERA
    MobileCountryCode = 244


Wifi not enabled phone  rebooted:

root@ubuntu-phablet:/# /usr/share/ofono/scripts/scan-for-operators 
Scanning operators on modem /ril_0...
Traceback (most recent call last):
  File "/usr/share/ofono/scripts/scan-for-operators", line 20, in <module>
    operators = netreg.Scan(timeout=100);
  File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 70, in __call__
    return self._proxy_method(*args, **keywords)
  File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 145, in __call__
    **keywords)
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 651, in 
call_blocking
    message, timeout)
dbus.exceptions.DBusException: org.freedesktop.DBus.Error.UnknownMethod: Method 
"Scan" with signature "" on interface "org.ofono.NetworkRegistration" doesn't 
exist

Another thing that resolves the issue is to run
/usr/share/ofono/scripts/online-modem, just found out and tried

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https://bugs.launchpad.net/bugs/1252737

Title:
  Ubuntu touch cannot get GSM signal if not joined to a WLAN network

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