Update cant_call_due_to_no_supported_service wording.

This string was used in the past when SIP calling was not available due
to it being disabled.  However, this situation now more commonly happens
when a watch relies on bluetooth to place calls; if bluetooth is turned
off the same generic message will arise.  Given this is the more common
case, changing wording.

Flag: NONE string resources are not flaggable.
Test: Manual test.
Fixes: 341979014
Change-Id: Ic46c78d83d254b448263332a3b64282948765fd3
diff --git a/res/values/strings.xml b/res/values/strings.xml
index ec278f0..aefd2e6 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -290,9 +290,11 @@
 
     <!-- Error message shown to the user when an outgoing call cannot be placed because there no
          calling service is present on the device which supports this call type.
-         This is typically encountered when the user tries to dial a SIP/VOIP call, but there are
-         no calling services present which support SIP calling. [CHAR LIMIT=none] -->
-    <string name="cant_call_due_to_no_supported_service">Call cannot be placed because there are no calling accounts which support calls of this type.</string>
+         This can happen on a device such as a watch or tablet which provides calling using a
+         service that may not be available all the time.  For example, a watch may rely on Bluetooth
+         to be enabled for calling to work; when Bluetooth is disabled calling would not work.
+         [CHAR LIMIT=none] -->
+    <string name="cant_call_due_to_no_supported_service">Can\'t make call. Check your device\'s connection.</string>
 
     <!-- Error message shown to the user when an outgoing call cannot be placed due to an ongoing
          phone call in a third-party app.  For example: