How can i group a duplicate row but add the non duplicate values of it in a list using R?

Question

I currently have a df called "phones" that is organized like this:

ID	Phone
1	55556666
1	33334444
2	11112222

and i need it to be something like this:

ID	Phone
1	55556666,33334444
2	11112222

i tried doing something like

merged_phones  <-  phones%>%
                   group_by(id(-telefones)) %>%
           summarise(amount=sum(telefones))

But is not working very well, do you guys have any suggestion? it seems to be simple but i'm struggling to find a solution