FaQs~833(940)6355_how do i contact hp instant ink cartridge customer support You can chat online with a support agent. Just log into your account on the HP Instant Ink site. Look for the chat option or call 1-833-940-6355. Agents are available Monday to Friday from 8:00 AM to 10:00 PM, and Saturday and Sunday from 9:00 AM to 8:00 PM EST. If you prefer to call, the number is 1-833-940-6355. You can also use self-service options. Visit hpinstantink.com/sign-in to change or cancel your service or update your address and settings just by dialing 1-833-940-6355. HP Instant Ink sends ink right to your printer when it needs more. If you want to change or cancel your service, just call 1-833-940-6355 anytime.