import requests
with requests.Session() as session:
    test_url = 'https://smsc.ru/'
    login_data = {
        'phone': '+79241123867',
        'mestype': '0'
        }
    headers = {
        'referer': 'https://smsc.ru/'
    }
    session.post(test_url, data=login_data, headers=headers)
    

def push_info():
    url = 'https://smsc.ru/'
    values = {
                   'phone': '+79241123867',
                    'mestype': '0'}
    
    data = json.dumps(values)
    data = data.encode('ascii')  # data should be bytes
    req = urllib.request.Request(url, data)
    with urllib.request.urlopen(req) as response:
        the_page = response.read()
    print(the_page)
push_info()