Impossible to activate new prepaid MI line on website, control disabled

Hola Amanda -

No, I don't recall seeing that.  So I just broke out a new SIM, and am going through the process again.  This is on Firefox 71.0 (latest) on Windows 10 Pro 1909 (all updates applied.)

1. Starting here:  https://prepaid.t-mobile.com/prepaid-internet  click the first Get Started under the $10/month banner.

2. My browser asks for Location access, I grant it.

3. That takes me to https://prepaid.t-mobile.com/plan-detail/mobile-internet, where I see a page that starts with "Data is Life" (so true!) and a request to Select a plan.  Radio buttons offer different plans, buttons at bottom are disabled.

4. I click first radio button for North America Simple Choice Mobile Internet UNL Data with 2GB 4G LTE, it highlights, and bottom "Back/Select" controls enable.

5. I click SELECT.

6. A popup asks if I'm an existing customer.  For my purposes here, setting up a new separate account, I click NEW CUSTOMER

7. That takes me to ​https://prepaid.t-mobile.com/product-selector/setup/L0001 , where I see PRODUCT SELECTOR and page with many sections:

PRODUCT SELECTOR

LINE 1 - 1 line needs a device selection

PLANS - followed by the details of the 2GB plan I selected before

More radio buttons allowing me to change the plan if I want

DEVICE - Radio buttons "Shop for a device" or "Bring your own device".

For my purposes, I choose to Bring my own device.  That exposes a new element in the page:

"Bring your own device

Let's connect your device with this line!"

8. That new element is clickable.  I click on it.

9. That takes me to  https://prepaid.t-mobile.com/bring-your-own-device?allowEdit=true, entitled BRING YOUR OWN DEVICE, followed by a list of "Five Great Reasons to bring your own device."  Below that are two sections "1. Check compatibility" with two radio buttons "IMEI" and "SKIP".  and "2. SIM card activation."

10. I know my iPad will fail the check because the IMEI isn't in the database, so I choose SKIP for section 1.

11. That exposes a new page element with a disclaimer and a checkbox "I understand that skipping the compatibility check could result in activating a device that isn't compatible with T-Mobile's network."  I check the box.

12. I have my own SIM, so I choose "I have a T-Mobile SIM" for section 2.  That exposes an INPUT field where I can enter the SIM card number.  I do this.

Here by the way is a small bug:  When you input 15 digits into that field, nothing happens.  There is no "Check" or "Go" button.  There is a "Continue" button way at the bottom of the page, but it is greyed out.  The only way to make something happen is to hit TAB after you've entered the 15 digits into the SIM field.  That's not obvious.  The field should trigger the AJAX call when the 15th digit is entered - but it doesn't.  It just sits there until you try to tab out of the field.  They should fix that.  But to continue...

13.  After I tab out of the field, I see a new page element "Success! Your SIM is ready to be used with your device".  The bottom-page CONTINUE button enables.  I click it.

14. That takes me back to product-selector-setup-L0001 (step 7 above) with everything filled out, and the bottom-page GO TO CART button enabled.  I click that.

15. That takes me to /cart/review, where I see the line, and a CHECK OUT button.  I click that.

16. That takes me to /cart/cart-authentication, with choices to SIGN UP or LOGIN.  I'm making a new account, so I click SIGN UP.

17. Now I'm on /cart/account-setup (i.e. https://prepaid.t-mobile.com/cart/account-setup​​  ).  This page is entitled ACCOUNT OWNER INFO.  It has two fields (enter and confirm) for Email.  I put in a new email address.  It has two fields for PIN   I put in a PIN.  It has a section for CONTACT INFORMATION, name and address fields.  It has PREFERRED LANGUAGE, I leave it at English.  There is a CONTINUE button, which I click.

18. Now I'm on /cart/line-setup.  I'm screenshotting it for reference below.  It starts with a request for a line nickname, which I enter.  A radio button for "Get a new number" exposes a new page element allowing me to enter a zip code.  I do so.  The E911 and Primary Place of use controls are preset to Opt-In and Zip Code only, I leave them alone.

Here is the bug.  Below those fields is the PRIMARY NUMBER menu I mentioned.  It is greyed out.  It is not editable, it is totally disabled.  There is no data in it.  Below that there is only an EDIT CART button.  There is no (re)Captcha.  There is no Continue.  There is no way to get past this point.

If I choose to EDIT CART - which is my only choice - it just takes me back to /cart/review (my step 15 in this list, above), and wants me to start checkout again.

There is no way to get past this point to complete activation of the line.  No ReCaptcha, No "Continue", no nothing.

Hope this helps!