Credit Card billing is not working

Try another browser. For me Chrome did not work, but everything worked in Firefox.

Same problem here...

I confirm I have had the same problem for the last two months. 

Problem not solved. New customer as of August 2020. Card worked only for set-up. Tried several times online these past two weeks until service ended. I called Customer Service today. I spoke s--l--o--w--l--y and deliberately and it still took three tries for an impatient representative to read the numbers back correctly. Rep not hear the word “6” three times and I spelled it s--i--x the second time. So a very l-o-n-g phone call for what should have been a 30 second online transaction. Anticipating that I will be a new customer of another carrier (most likely AT&T) next month.

Can confirm that -- have the same issue. The credit card payment stopped working in Chrome & Firefox and only works in Microsoft Edge.

It worked just fine about a month ago, almost certain that T-Mobile has updated online payment interface since then and broke compatibility with other browsers.

Sounds like an example of bad software development and absence of quality assurance.

For anyone stumbling onto this conversation, one problem is probably that T-Mobile’s website is not compatible with certain web browsers.

I had a customer service representative tell me that my card was invalid (I assume she was also using an incompatible web browser). Then, I had the same problem trying to use Firefox to pay my bill through the website.

Finally, I was successful by using Microsoft Edge as my browser.

I love how tmo_chris  listed this as solved. Its obviously  not an individual issue. ive been with tmobile for over 10 years and i constantly have this issue for months of the year. I have been dealing with it since April. It is not August 2020. This is not solved and its been an ongoing issue with tmobile for years. If you look on google “tmobile online card not valid” is always been a problem with tmobile. They are quick to share your private information with other companies but are not willing to fix their online or phone payment options. The automated system on my phone doesnt work either so every month i am forced to release my credit card information to someone living in another country after being on hold for a half hour. Get it together tmobile and dont list problems as “solved” and say its an individual problem when you arent willing to listen to anyone who has posted this issue.

Same issue still happening. Any card I enter says invalid number. Your system is garbage. How is this still happening years later. Fix it so I can pay my bill on time!

SAME PROBLEM FOR TWO MONTHS!!!!  How the heck are we supposed to pay our bills????

I am having the same issue.  I have about 15 minutes to pay bills before work at 6AM, and don’t want to have to make noise to disturb others in my home, or be late for work by dealing with a phone call-- that is why I pay bills online.  Please fix this system or implement a replacement system that is functional.