Legacy Pre-paid - options for service?


    I am a legacy pre-paid customer (flip phone), use the phone for occasionally emergency service.  Just adding additional money to my account.  Went to confirm the account is still active and see no bars. From googling, seems old flip phones on 2G are not well supported.  What are the alternatives?  What flip phones support these legacy plans?  Alternatively, could I also buy a used older smart phone and turn off mobile data (legacy is voice only plan) - and if so, could I get a replacement (micro or nano) sim?

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