Possibly when the local residents cease challenging Telus over the installation of cellular infrastructure in the area.
If you can get all your friends to add to a suggestion in the Ideas section, it will add support to such an installation.
When will the Slocan Valley have sevice? I understand only one tower is needed for the dead air space.
There are towers at South Slocan and Nakusp, then nothing until Revelstoke. For the space in between, more than one tower will likely be needed. Likely one at either end of the lake or a higher powered one in the middle. Terrain is a big factor. People not wanting towers, as @NFtoBC linked to, also doesn't help.
@TwitchyPuppy since the tower was approved a very long time ago and still not yet installed, I'd suspect there is a good chance that vocal minority is still fighting against the tower installation.