Uphold customer support hours depends on the type of issues you are facing, ☎️ 1-(830)-289-3623 is the 24/7 helpline number for US. Email and Chat support is available Mon to Fri (9 AM to 6 PM), but customer service at ☎️ 1-(830)-289-3623 can be availed 24 7 - 365 days a year.