Updating iOS
I have iphone 6 plus. Do you recommend me to update the iOS 11.2.6 to the latest version? I mean which version of iOS better for this device?
iPhone 6 Plus, iOS 11
The most current version an iPhone 6 Plus can run is iOS 12.5.3. And yes, it its always recommended to update to the most current version the device can run. Since updates fix vulnerabilities and software issues. Leaving a device without an update can result in issues and the loss of support of certain apps.