That is the Ultra Mobile Paygo SIM. Their embedded eBay link is dead but searching on eBay manually gives me the Paygo SIM for $15.99
I assume once you pay that, you subscribe to the $3/month package.
This SIM, once registered in the US, will work for sms messages on a Thai mobile network? Or does some other setup options need to be done while still in the US for this to work?
I see eBay also lists some pre-activated Paygo SIM cards. The 'most popular one for $39.95 has 60-days validity. For a total of $86.95, they will also precharge it with $35 credit which gives 1-year validity. This option allows you to select a zip or area code and they'll acquire a local number for that selection.
This Ultra Mobile SIM Card (PayGo) is used in any unlocked phone that supports VoLTE (4G & 5G) service. It can be used in the USA and International (Roaming Fees Apply), or enable WIFI Calling and pay no roaming fees if outside the USA.
Ultra Mobile SIM Card
Ultra-Mobile $3/mo. pre-paid plan!
Uses T-Mobile Towers
100 Minutes & 100 Texts & 100 MB per month
Service Pre-Activated!
Cancel service anytime
Service available in the USA
No International Roaming Fees if using WIFI Calling
or, International roaming fees apply if using cellular towers outside the USA.
This SIM Card comes pre-activated from the date it is shipped. It also comes with 30-days of service; including 100 minutes, 100 text messages, and 100 MB of data. It works anywhere in the USA where T-Mobile's 4G LTE towers are available. Unlocked 5G or 4G VoLTE device required.
We assign a new phone number and generate an online account for you, so all you have to do is logon and add a payment method for recurring billing. Or, if you do not want to enroll in automatic payments, you can simply logon to your online account and make your $3/month payment every 30-days.