$ cat file.txt
+62 891-8599-2497
+62 831-6426-768
+62 818-633-881
+62 899-480-273
+62 874-1264-291
To delete the ‘+’, ‘-‘ characters and blank spaces after the ‘-‘ is removed.
% sed 's/[+-]//g' file.txt | tee file_temp.txt && sed 's/.//3' file_temp.txt | tee file_final.txt