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https://support.apple.com/en-us/HT204497Join Wi-Fi networks automatically
Your iPhone, iPad, and iPod touch can remember network and login information so that you can automatically reconnect to that network when you're in range.
If your device doesn't automatically join a captive Wi-Fi network, follow these steps:
Tap Settings > Wi-Fi.
Tap next to the network name.
Make sure that Auto-Join is on.
If you don't want to connect automatically, turn off Auto-Join. To see the Welcome screen the next time that you connect to the network, turn off Auto-Login.