Restore the phone again, and this time, select the option "set up as a new phone".
Problem updating ipad
I would suggest you to try using Yahoo mail from there, preferably from an apple store. My guess is that this was not at all i Phone or i Pad related.
A lot of problems with the Wi-Fi connection appear on the i OS 10 update which, causes slowness and not maintaining a stable internet connection on the i Phone 6.
There are only few things you can do on an i Pad without an active internet connection, which is why it is essential to make sure you can connect to a stable Wi-Fi network with good speed and stability.
Without worrying about breaking suddenly when downloading apps, sending emails and surfing the web.
Issues can however occur that may prevent your i Pad Air/i Phone 6s from properly connecting to a stable network, all of which can be easily rectified as outlined in the following list of method on fixing Wi-FI for i OS 10.
Check your router and ensure that Wi Fi is actually turned on.
Many modern routers have a switch or button that allows you to enable and disable the Wi Fi connection.
It isn’t difficult to incorrectly type a password, especially if it is a difficult combination of letters, numbers and special characters.
Ensure that you are typing in the correct password and you may just find that it is the solution you are looking for.