After some operations I have a series that i got after grouping by phone number and counting different calls. I need to count the phone numbers that have an equal number of calls. I mean, if there is 5 people who made 3 calls I need to get a series or a dataframe looking like:
num_calls
3 5
1 100
...
My series now looks like
phone_num
89248089190 5
48048102481 6
12948148014 2
14091404108 5