How can I get my iPhone out of landscape mode and back to portrait?

if there is a icon in the top left with a padlock and a spinning arrow around it then do this:

double click home button > slide the apps in the bottom tray that came up to the right, you'll see the same icon thats on the top left > tap that to DISABLE rotation lock

Orientation lock only locks in portrait mode, there is no lock for landscape.

Reset your phone:

Press the sleep/wake button & home button at the same time, keep pressing until you see the Apple logo, then release.

What app are you in? Some apps only support landscape mode.

Try following - 1 by 1:-

* make sure portrait lock is not on & try turning on/off several times

* turn off mobile and turned it back on

* hard reset by pressing lock and home at same time

If problem persist, you need to try following but be careful since the following impact your iphone.

* resetting all setting: this will reset all settings of your iphone back to factory setting

* resetting all setting by erasing all data: this will reset all setting and erase all data so do back-up and proper syncing and read relevant details

* restoring from itunes: this will also erase all data and take mobile back to day 1

last 3 options are last resort and only be done if you are sure you can restore your data.

Please don't hold me responsible for any data loss while doing last 3 options 🙂

Cheers!