Update test to not assume 2 max SIMs

Bug: 145710242
Test: passes existing tests
Change-Id: I6546acb58a25d161634986348e7122e12c2b7c04

cmds/telecom/src/com/android/commands/telecom/Telecom.java

@@ -366,12 +366,8 @@ public final class Telecom extends BaseCommand {
     }
 
     private void runGetMaxPhones() throws RemoteException {
-        // This assumes the max number of SIMs is 2, which it currently is
-        if (TelephonyManager.MULTISIM_ALLOWED == mTelephonyManager.isMultiSimSupported()) {
-            System.out.println("2");
-        } else {
-            System.out.println("1");
-        }
+        // how many logical modems can be potentially active simultaneously
+        System.out.println(mTelephonyManager.getSupportedModemCount());
     }
 
     private void runSetEmergencyPhoneAccountPackageFilter() throws RemoteException {