A thin blue line on my iPhone 4S?

Hi.
Today I woke up to see a thin blue line on my iPhone 4S screen.
I did not drop my phone, nor did I even charge it over night. I just left it on.
The blue line looks like this:
(I recreated the image, since it doesn't appear if I take a screenshot, meaning this is a screen problem.)
I have tried restarting my phone, but that hasn't helped. The line appears all the time, no matter if I'm in an app or looking at the home screen.
I'm not sure how this happened, as it just appeared all of a sudden, but I'm wondering if anyone knows a fix for this?
My warranty for my phone has run out, unfortunately. =/
Thanks.

Did you also try to reset the phone by holding the sleep and home button for about 10sec, until the Apple logo comes back again?
You will not lose any data by resetting, but it can cure some glitches.
If this does not help,and to rule out a software problem, setting it up as new device would be the next step:
Use iTunes to restore your iOS device to factory settings - Apple Support
If still no luck, the phone needs to be serviced, but since Apple does not offer to replace the screen for an iPhone 4s, you would have to pay the service fee to replace the whole device.
Out-of-warranty repair service
If your repair isn’t covered by Apple’s One Year Limited Warranty, AppleCare+, or AppleCare Protection Plan, your iPhone might be eligible for out-of-warranty service. For example, liquid damage isn’t covered by warranty but might be eligible for out-of-warranty service. Some damage isn’t eligible at all, for example if your device has been broken into multiple pieces. See Apple’s Repair Terms and Conditions for complete details.
Read Apple’s Repair Terms and Conditions
Model
Out-of-warranty service fee
Battery service*
iPhone 6 Plus
$329
$79
*available only if battery
fails Apple’s diagnostic test
iPhone 6
$299
iPhone 5s, iPhone 5c, iPhone 5
$269
iPhone 4s
$199
iPhone 4, iPhone 3GS, iPhone 3G,
Original iPhone
$149
Plus a $6.95 shipping fee, if required. Fees are in USD and exclude local tax. Pricing is for service through Apple. The final service fee we charge will be determined during testing and may be less than the service fee listed above. Pricing and terms vary for service through an Apple Authorized Service Provider.
copied from Service Answer Center - iPhone

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