Q: your session has timed out. Try again

Go to Settings > iCloud > Account > Storage Plan:Payment Information.

Type in the credit card security code there. Fixed it for me.

The storage plan payment info fix worked for me. I've been bouncing around these forums for a fix and michaelc's suggestion solved my problem.

Thank you!  This fixed my problem too.

Thanks! It's the third suggestion I followed, and this one did the trick for me :)

Michaelc's suggestion worked perfectly for me.

I had the same problem. I was trying to purchase an app but it kept saying my session had timed out. First i went to app store settings to update my payment information but it did not let me do that. Then i followed the instructions and went to iCloud  and it worked well. Thank you fir your help

The suggestion to:

Go to Settings > iCloud > Account > Storage Plan:Payment Information.

Type in the credit card security code there. Fixed it for me.

... Worked for me.

Thanks for the tip

I have tried going through iCloud and setting payment info but to no avail. It still won't let me download. Any suggestions?

after the iCloud part then go to the Appstore of iTunes app and sign out (by scrolling to the end of the first screen and clicking your account name). Then sign back in.

Ok I tried that too. Still doesn't work. Any more suggestions?

After trying other options this worked first time. Many thanks

I would like to hear more suggestions as well. I've tried everything suggested in this thread.

I went on to my desktop computer to iTunes and downloaded from there. Once I submitted my three forced questions there I was able to get through on my phone. Didn't work until I used the computer.

Going to Icloud for the payment info worked, but now I get the same "account timed out" for accepting the useage agreement.  Anyone had another fix?