iPhone 3G3 screen won't display landscape mode

hi,

noticed none of programs on phone display in landscape mode when tilt it.

new issue , not 1 i've encountered before. possible app downloaded caused this? prior downloading apps (which had never done until month ago), phone display in landscape mode no problem.

suggestions?

thank-you.

 

double tap home button, scroll left , there icon turn landscope mode on , off, check

 

Forums iPhone, iPad, and iPod Touch iPhone iPhone Tips, Help and Troubleshooting

• iPhone
• Mac OS & System Software
• iPad
• Apple Watch
• Notebooks
• iTunes
• Apple ID
• iCloud
• Desktop Computers
• Apple Music
• Professional Applications
• iPod
• iWork
• Apple TV
• iLife
• Wireless