while (gresit)
{
    fgets(p[i]->telefon, 11, stdin);
    len = strlen(p[i]->telefon);

    p[i]->telefon[len - 1] = '\0'; // fara \n la sfarsit

    if (p[i]->telefon[0] != '0' || len != 10)
    {
        printf("Numarul nu incepe cu 0 sau nu are 10 cifre!");
        gresit = 1;
    }

    else
    {
        gresit = 0;

        for (j = 0; j < len; j++)
        {
            if (!isdigit(p[i]->telefon[j]))
            {
                gresit = 1;
                break;
            }
        }
    }
}