how entering zoom when i changing my cellphone usim for trip

Hi im korean user of zoom and im so appreciate to use your program, its so helpful for communicate with others. 

but i have some problem about using that. 

i have some plan to communicate my friend with zoom. because of my friend is in trip for 2weeks 

i think she is in swiss now.. when sending my zoom meeting link to her, she can't entering my link

so i ask for your site to solving this problem.

how can she entering my zoom meeting link?  

please anybody make me answer for this problem..  i really hope so