A:AnswerThe Deskjet 2755 printer is compatible with computers running the following operating systems: Windows 10, 7; MacOS Sierra v10.12 (previously OS X), macOS High Sierra v10.13, macOS Mojave v10.14, macOS Catalina v10.15.
A:AnswerThe Deskjet 2755 printer has WiFi direct capabilities, therefore you can print directly to this printer from your iPhone without a WiFi network.
A:AnswerLinux drivers are not provided on the printer installation discs packaged with new printers. It is likely that your Linux system already has HP's Linux Imaging and Printing drivers (HPLIP) installed. Most major Linux releases include the HPLIP drivers with the distribution installation.
If the HPLIP drivers are not installed or you need to update the drivers, go to http://www.hp.com/go/linuxprinting.
A:AnswerYes, this works with windows 10, which is what I have. I have not printed legal size paper but it will print it. I have no idea about your last question.