/usr/share/bash-completion/completions/mbimcli is in libmbim-utils 1.14.2-2.1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83  | # mbimcli(1) completion                                      -*- shell-script -*-
_mbimcli()
{
    local cur prev words cword split
    _init_completion -s || return
    case $prev in
        '-d'|'--device')
            _filedir
            return 0
            ;;
        '--no-open')
            COMPREPLY=( $(compgen -W "[Transaction-ID]" -- $cur) )
            return 0
            ;;
        '--set-radio-state')
            COMPREPLY=( $(compgen -W "[(on|off)]" -- $cur) )
            return 0
            ;;
        '--enter-pin')
            COMPREPLY=( $(compgen -W "[current-PIN]" -- $cur) )
            return 0
            ;;
        '--change-pin')
            COMPREPLY=( $(compgen -W "[(current-PIN),(new-PIN)]" -- $cur) )
            return 0
            ;;
        '--enable-pin')
            COMPREPLY=( $(compgen -W "[current-PIN]" -- $cur) )
            return 0
            ;;
        '--disable-pin')
            COMPREPLY=( $(compgen -W "[current-PIN]" -- $cur) )
            return 0
            ;;
        '--enter-puk')
            COMPREPLY=( $(compgen -W "[(PUK),(new-PIN)]" -- $cur) )
            return 0
            ;;
        '--connect')
            COMPREPLY=( $(compgen -W "[(APN),(PAP|CHAP|MSCHAPV2),(Username),(Password)]" -- $cur) )
            return 0
            ;;
        '--phonebook-read')
            COMPREPLY=( $(compgen -W "[(Phonebook-index)]" -- $cur) )
            return 0
            ;;
        '--phonebook-write')
            COMPREPLY=( $(compgen -W "[(Name),(Number)[,(Index)]]" -- $cur) )
            return 0
            ;;
        '--phonebook-delete')
            COMPREPLY=( $(compgen -W "[(Phonebook-index)]" -- $cur) )
            return 0
            ;;
        '--dss-connect')
            COMPREPLY=( $(compgen -W "[(UUID),(Session-ID)]" -- $cur) )
            return 0
            ;;
        '--dss-disconnect')
            COMPREPLY=( $(compgen -W "[(UUID),(Session-ID)]" -- $cur) )
            return 0
            ;;
        '-V'|'--version')
            return 0
            ;;
        '-h'|'--help'|'--help-all'|'--help-basic-connect'|'--help-phonebook'|'--help-dss'|'--help-ms-firmware-id'|'--help-ms-host-shutdown')
            return 0
            ;;
    esac
    $split && return 0
    if [[ $cur == -* ]]; then
        COMPREPLY=( $( compgen -W '$( _parse_help "$1" --help-all )' -- "$cur" ) )
        [[ $COMPREPLY == *= ]] && compopt -o nospace
        return 0
    fi
} &&
complete -F _mbimcli mbimcli
# ex: ts=4 sw=4 et filetype=sh
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