AT&T based BYOD SIMs and phones suddenly disappeared from the Straight Talk website. Straight Talk's parent company America Movil says the SIMs are out of stock. Many people, myself included, doubt that. I suspect that there's a commercial reason for the AT&T products disappearance. Maybe a contract dispute between AT&T and America Movil, or perhaps changes to the wholesale prices that America Movil pays to AT&T or the other operators that Anerica Movil use make it more profitable for to sell anything but AT&T.
Whatever the cause, if you need or want AT&T on Straight Talk there's still a way to buy the SIMs and a couple of ways to buy AT&T based Straight talk phones.
Walmart has AT&T Straight Talk SIMs. Click one of the links below to buy one.
Straight Talk AT&T Compatible SIM Card $14.96
Straight Talk AT&T Compatible SIM w/ $45 AirTime Card Bundle ($5 Savings) $54.96
Update: As of Feb 25, Walmart ids out of stock on the AT&T SIM Cards
These are regular, standard sized SIMs, Walmart is sold out of Straight Talk micro SIMs. If you need a micro-SIM, this $4.11 SIM cutter from amazon.com does a good job of cutting a regular one down to micro size. For iPhone 5 users, Amazon also has nano-SIM cutters for about the same price.
The following Straight Talk AT&T Android phones are still available at Walmart too:
Straight Talk Samsung Galaxy SII Prepaid Cell Phone w/ Bonus Starter Kit $299.99 (sale, reg $349.99)
Update 2/25: Walmart has sold out of the Galaxy S II.
Straight Talk ZTE Merit Z990G Prepaid Cell Phone $111.07 (sale, reg $129.88)
Straight Talk LG Optimus Logic Cell Phone $89.99
You can also still buy AT&T phones directly from Straight Talk by using an AT&T-only zipcode (you don't need to actually live in that zip code). Here's how:
Go to www.straighttalk.com. Click Phones under the Shop tab.
Enter 65046 or 76825 in the zipcode field and say yes to the prompt asking if you will use the phone in that location.
All the phones on the next page use AT&T. Add the one you want to the shopping cart and click Procced to Checkout.
On the next page, Fill in your shipping and billing information. Be sure to change the shipping zipcode back to your real one and complete the checkout
When the phone arrives it will activate and work provided you have native AT&T coverage in your location. If you aren't sure use, AT&T's prepaid coverage map to check.
Is there a risk that your AT&T based SIM or phone will stop working if America Movil discontinues AT&T based products? Possibly, but I think it's unlikely. There are millions of America Movil customers using the AT&T network. cutting them off would generate a big revenue hit and generate loads of bad publicity. If America Movil stops selling AT&T I'm certain they would grandfather current users. There's a precedent for grandfathering too. America Movil stopped activating CDMA phones in US Cellular markets a couple of years ago but phones activated before the cut off still work on US Cellular