If this is what you're looking for, I bought mine on Amazon on Saturday for 99c and it was delivered the next day. They have a new sim card that works for all carriers now.
If you can get the iPhone unlocked, all you need is a new SIM Kit which includes the SIM cards for all three networks, AT&T, Verizon snd T-Mobile.
You can pickup the SIM Kit at Target or order one from Amazon for $0.99 which is delivered to your home for free if you have Amazon Prime. I did this a couple weeks ago and it took a couple days to get the SIM Kit.
Tracfone Keep Your Own Phone 3-in-1 Prepaid SIM Kit https://www.amazon.com/dp/B0728N8PT9/ref=cm_sw_r_apan_glt_i_9FWY36QEYDT3QNGZK8FW?_encoding=UTF8&psc=1
After you get the SIM Kit, contact Tracfone via chat and tell them you want to transfer your number to a different phone and that you have a new Verizon SIM. It took about 20 minutes.
For Amazon Deal, need to buy SIM from Amazon
More info at http://https://amazonsimrewards.com/
For eBay Deal, need to buy from eBay
More info at http://ebaysimrewards.com
There is a slight money maker chance if you want to try out Net10, cause SIM is $1 and minimum first month payment is $20, I don't know how much it will cost overall after taxes, but maybe like $1~4 Money Maker lol
Step 1: Purchase a SIM KIT & qualifying service plan anytime from 2/27/2020 through 4/30/2020. SIM KIT must be sold & shipped by Amazon or the tracfonewireless eBay store.
Step 2: Activate your service by 4/30/2020. You will automatically received a text message within 10 business days of activation. The text message will include a unique redemption code and instructions on how to redeem your Gift Card.
Step 3: Redeem your unique code with the instructions from the text message you receive. Please note that the unique code sent via text message can only be redeemed once and cannot be replaced. Limit of 1 Gift Card per qualifying phone number permitted.
For all of these: Promotion valid ONLY on SIM Cards shipped from and sold by Amazon or the tracfonewireless eBay store. Purchase date of SIM must have started on 2/27/2020 to Qualify.
Tracfone:
Amazon
https://www.amazon.com/dp/B0728N8PT9
eBay
https://www.ebay.com/itm/283230124002
Get a $25 eGift Card when you purchase a Tracfone Sim Kit and activate a new line of service by 4/30/2020 on the Tracfone website. Min. $19.99 plan required with service charge and applicable sales tax due at sale.
Total Wireless:
Amazon
https://www.amazon.com/dp/B072FTW1MB
eBay
https://www.ebay.com/itm/283230148008
Get a $25 eGift Card when you purchase a Total Wireless Sim Kit and activate a new line of service by 4/30/2020 on the Total Wireless website. Min. $25 plan required with service charge and applicable sales tax due at sale.
Simple Mobile:
Amazon
https://www.amazon.com/dp/B072M18F3H
eBay
https://www.ebay.com/itm/283230138604
Get a $25 eGift Card when you purchase a Simple Mobile Sim Kit and activate a new line of service by 4/30/2020 on the Simple Mobile website. Min. $25 plan required with service charge and applicable sales tax due at sale.
Net10:
Amazon
https://www.amazon.com/dp/B071FM63JT
eBay
https://www.ebay.com/itm/283230133796
Get a $25 eGift Card when you purchase a Net10 Sim Kit and activate a new line of service by 4/30/2020 on the Net10 website. Min. $20 plan required with service charge and applicable sales tax due at sale.
I got a g7 power with the tracfone sim kit from amazon. Bought the $15 500/500/500 plan from target. Activated & it did not get locked since it is unlocked to begin with.
Not fantastic, since these are $1 add-ons and you have to pay for a plan, but maybe good if you happen to be there anyway?
For all of these: Promotion valid ONLY on SIM Cards shipped from and sold by Amazon. Purchase date of SIM must have started on 3/1/19 to Qualify.
TracFone: https://www.amazon.com/Tracfone-Keep-Your-Phone-Prepaid/dp/B0728N8PT9
Get a $25 Amazon eGift Card when you buy a Tracfone Sim Kit and activate a new line of service by 4/30/2019 on the Tracfone website. Minimum $15 plan required with service charge and applicable sales tax due at sale. eGift Card sent within 7-14 days of activation. While supplies last.
Total Wireless: https://www.amazon.com/Total-Wireless-Keep-Phone-Prepaid/dp/B072FTW1MB
PROMOTION: Get a $25 Amazon eGift Card when you buy a Total Wireless Sim Kit and activate a new line of service by 4/30/2019 on the Total Wireless website.Single Line $25/$35 plan required with service charge and applicable sales tax due at sale. Multi Line Airtime Plan does not Apply. eGift Card sent within 7-14 days of activation. While supplies last.
Simple Mobile: https://www.amazon.com/Total-Wireless-Keep-Phone-Prepaid/dp/B072FTW1MB
PROMOTION: Get a $25 Amazon eGift Card when you buy a Simple Mobile Sim Kit and activate a new line of service by 4/30/2019 on the Simple Mobile website. Minimum $25 plan required with service charge and applicable sales tax due at sale. eGift Card sent within 7-14 days of activation. While supplies last.
Net10: https://www.amazon.com/Net10-Keep-Your-Phone-Prepaid/dp/B071FM63JT
PROMOTION: Get a $25 Amazon eGift Card when you buy a Net10 Sim Kit and activate a new line of service by 4/30/2019 on the Net10 website. Minimum $20 plan required with service charge and applicable sales tax due at sale. eGift Card sent within 7-14 days of activation. While supplies last.