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 i tried doing this, i have a razr flip phone i bought on ebay, brand new still in box, compatible with t-mobile, they said they don’t give out sim cards anymore for those. 
 What carrier?  What year was the razr? 
 2010, t-mobile 
 I wound just ask for a SIM card on a new line, leave the store and put it in the phone. Worst that happens is you have to get a newer flip phone. 
 I ask because some older phones from the 2G and 3G era no longer are compatible. 
 so dumb. i just want to make calls and texts i don’t want any internet 
 Found the problem.. According to GSMArena it looks like the V3xx (which I think is that type of phone) only does 850/1900 3G. The issue would be that T-Mobile is in the process of repurposing 1900 3G spectrum as B2 LTE.

I'm sure you can find a newer flip phone but yes.. that phone will likely stop working even if - in your area - it works right now. I'd be willing to bet the seller on eBay knew that too. 
 But for overall durability and price these are excellent. 

https://www.amazon.com/CAT-FLIP-BLACK-T-MOBILE-LOCKED/dp/B0BZQKYKQF/ 
 Actually buy the unlocked CAT flip. Supports a broader range of bands and carriers. 

https://www.amazon.com/Cat-S22-Flip-Touchscreen-Resistant/dp/B0BTTQGVVW/