Yup. Surely in favor of implementing these things. Payphones are already a thing (were in SA:MP and I recon will be carried on here as well) and I am quite sure phones can surely be dropped away as well. A burner phone system used to be in the game, but well, it was a little bit hard for me to understand so I didn't care to use it. Nevertheless, a great idea to be implemented. Payphones were useful in prison and on the outside as they enabled people to make confidental calls. Also, make it to where this time you can actually type and scroll chat outside the payphone. I found it an issue, at least for me, in LS-RP in SA:MP.
Also, the inventory system benefits burners system a lot as it's easier to maneuver around it.