How to Fix Telegram Please Check Your Internet Connection and try again iPhone.
Solution 1. Check Your WiFi and Mobile Data.
Make sure that your iPhone is connected to the internet via Wi-Fi or cellular data.
Sometime the Telegram doesn't work due to the weak Wi-Fi or cellular data.
Method 2. Check Date and Time Settings.
Incorrect date and time settings can cause connectivity issues.
1. Launch the Settings menu.
2. Now tap General under the Settings menu.
3. In the General, tap on Date & Time.
4. Here, make sure Set Automatically is turned on.