Bug 1082234 - Set a default value when the stored value is unavailable
Bug 1071366 - Add the missed case of erasing call forwarding settings
Merge pull request #25159 from crh0716/1071366

Bug 1071366 - Add the missed case of erasing call forwarding settings r=jaoo
Merge pull request #25120 from crh0716/1082234

Bug 1082234 - Set a default value when the stored value is unavailable r=alive