@fivetalents You should have no problem reactivating your old Sprint phone with a Red Pocket CDMA SIM, provided your phone’s ESN number has not been reported as lost/stolen and there is no unpaid balance on an existing account. To activate the Red Pocked SIM card you must supply the phone’s ESN number. The Activate section reads, "Sprint or Verizon-compatible phones-CDMA ESN/MEID (for all Sprint phones or Verizon compatible 3G phones) or LTE CDMA IMEI (for Verizon compatible LTE phones)
As an aside, to activate a GSM card for use with AT&T or T-Mobile, you DON’T need to provide a phone IMEI number, you only need the ICCID number from the SIM card itself, That means a Red Pocket T-Mobile GSM SIM card can be placed in any T-Mobile (or carrier unlocked) GSM phone, provided it is size compatible.

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Southern Guns has a 50% coupon code (TacMuff) that can be applied to already discounted prices.
I ordered a couple of Blackhawk T’s, (19.99 reduced to 9.99, then $5 with coupon) 2-day shipping for both was $7.50. The code might also work with other apparel items not shown on the landing page.
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@fivetalents I purchased three of the 360 day Red Pocket 100min/100text/500MB data plans. I received activation numbers via email within a couple of hours and SIM kits about a week later. The SIM kits contained GSM cards for AT&T, T-Mobile, and a single CMDA card for use on either Sprint or Verizon networks. Each activation number will activate only one of the three cards provided. (When one card is activated the other two cards become invalid.) By definition, an unlocked GSM-only phone will not accept CDMA SIM cards; And, while unlocked CDMA/GSM phones accept GSM cards they may not provide full LTE coverage. As an example, an unlocked Samsung Galaxy S7 G930P (Sprint) will only support two of the four channels used by the T-Mobile network. I don’t know if an unlocked Samsung Galaxy S7 G930T (T-Mobile) will accept any CDMA SIM cards, but I had no problem using Red Pocket T-Mobile SIM cards in my carrier-locked T-Mobile phone. As I alluded in another post, there is a difference between carrier-locks and boot-loader locks. Boot-loader locks are installed on some pre-paid phones to prevent discounted, low-cost phones from being used with another plan.

@phat200 The error message is probably because the AT&T network is GSM-only–it doen’t use CDMA. More importantly, if your AT&T-network phone was specifically built for one of AT&Ts prepaid service providers, it may have a custom boot-loader that prevents it from being carrier-unlocked. I recommend some research into your particular phone model, or perhaps just purchasing a 15-day prepaid sim first.