gsmsmsstore: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/gsmsmsstore - from package: gsm-utils

You may install the required package with command apt-get install {package}

Error in other languages:
gsmsmsstore: bevel nie gevind nie
gsmsmsstore: comandă negăsită
gsmsmsstore: comando não encontrado
gsmsmsstore: commande introuvable
gsmsmsstore: command not found
gsmsmsstore: käsku ei ole
gsmsmsstore: không tìm thấy lệnh
gsmsmsstore: komanda nerasta
gsmsmsstore: Kommando nicht gefunden.
gsmsmsstore: kommandot finns inte
gsmsmsstore: komut yok
gsmsmsstore: nie znaleziono polecenia
gsmsmsstore: níor aimsíodh an t-ordú
gsmsmsstore: no se encontró la orden
gsmsmsstore: no s'ha trobat l'ordre
gsmsmsstore: opdracht niet gevonden
gsmsmsstore: parancs nem található
gsmsmsstore: perintah tidak ditemukan
gsmsmsstore: príkaz nenájdený
gsmsmsstore: příkaz nenalezen
gsmsmsstore: команда не найдена
gsmsmsstore: командата не е открита
gsmsmsstore: 命令找不到
gsmsmsstore: コマンドが見つかりません