**Hi , i wanted to fetch user’s info (username and profile picture) using their phone number using telethon.
but i got an error related to rate limit of the request ImportContactRequest.
consider i have a file containing thousands of phone numbers of company’s customers, i did process the number, made a list then wanted to fetch data for each number, the below is some of the related code :

at main.py file :**

..... 

counter = 0
    for number in numbers:
        try:
            print(f"executing no.{counter}: {number}")
            x = await client.fetch_user_info(number)
            if x:
                results.append(x)
                counter += 1
                # TRIED TO SLOW DOWN THE REQUESTS HERE
                if counter % 30 == 0:
                    await asyncio.sleep(30)
                else:
                    await asyncio.sleep(2.2)
        except Exception as e:
            print(f"ERROR HAPPENED DURING PROCCESS OF NUMBERS => {e}")

.....

at fetcher.py which containing the Fetcher class which offers method like connecting to telegram and other method but the method in discuss here is the below :

class Fetcher:


    ....
    # OTHER CODES INCLUDE THE INSTANTIATING TelegramClient OBJECT, AND STARTING A SESSION.
    # THESE ARE WORKING FINE
    ....

    # THIS METHOD DOING THE FETCH DATAS JOB
    async def fetch_user_info(self, contact_number):
        contact = InputPhoneContact(
            client_id=random.randrange(2**63),
            phone=contact_number,
            first_name="temp",
            last_name="temp",
        )
        max_retries = 5
        # TRIED TO IMPLEMENT SOME SORT OF EXPONENTIAL BACKOFF IF RATE LIMIT HAPPENED
        for attempt in range(max_retries):
            try:
                data = await self.client(ImportContactsRequest([contact]))
                if data.users:
                    user = data.users[0]
                    user_id = user.id
                    username = user.username
                    photo_file_path = None
                    if user.photo:
                        user_photos = await self.client(
                            GetUserPhotosRequest(
                                user_id=user_id, offset=0, max_id=0, limit=1
                            )
                        )
                        if user_photos.photos:
                            photo = user_photos.photos[0]
                            photo_file_path = (
                                f"reports/profile_pictures/pf_{contact_number}.jpg"
                            )
                            await self.client.download_media(
                                photo, file=photo_file_path
                            )

                    await self.client(
                        DeleteContactsRequest(
                            id=[
                                InputUser(user_id=user_id, access_hash=user.access_hash)
                            ]
                        )
                    )
                    return {
                        "contact_number": contact_number,
                        "has_account": True,
                        "username": username,
                        "pf_file_path": photo_file_path,
                    }

                else:
                    return {"contact_number": contact_number, "has_account": False}
            except errors.FloodWaitError as e:
                wait_time = e.seconds
                print(f"Rate limit exceeded. Waiting for {wait_time} seconds...")
                await asyncio.sleep(wait_time)
            except Exception as e:
                print(f"An error occurred: {e}")
                if attempt < max_retries - 1:
                    sleep_time = 2**attempt
                    print(f"Retrying in {sleep_time} seconds...")
                    await asyncio.sleep(sleep_time)
                else:
                    raise

**as you see i tried to slow down the requests and implemented exponential backoff , the issue is even with slowing down the proccess telegram automatically terminates all sessions related to the phone number i instantiated TelegramClient with. (which is my personal number) ,, tried to use a bot because i thought the rate limit for a bot will be different but for bot the mentioned method is not provided at all ( you can’t fetch user data based on phone number )

SO IS THERE ANY WAY TO DO IT AT ONE GO ? IS THERE SOMETHING I AM DOING WRONG ? IS THERE A BETTER WAY FOR GETTING WHAT I WANT DONE ?**