OK thanks! So I know that if I register LostMode then I can't stop people from using lost mode but I can stop people from using LostMode.
If you use LostMode as your company, product or service identifier, and there is no one else with prior and existing rights in the name, you can prevent someone else from using LostMode (or a similar name) for their own company, product or service in a way that confuses consumers or that dilutes the strength of your mark or that disparages your mark.
You cannot prevent people from using LostMode to describe your company and you cannot prevent people from using the words lost and mode.
It will be up to you as the trademark holder to police the market to ensure your rights in the mark are not being infringed.
And, again, you will probably want to do a search that includes more than just a USPTO record search, as rights to a trademark in the U.S. arise from the use of the mark in commerce and not through registration. Running everything by an attorney in your area can always be smart, too, to ensure that all that needs to be considered is considered.
Good luck with your company, masonmilby.