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It does need to stay current as Alexa Calling uses that as a reference for the two accounts to connect a call. 

TextNow has recently started enforcing their “use policy” and is offering a “number lock in service at $4.99/year to prevent this from happening".

https://help.textnow.com/hc/en-us/articles/1500003971461-How-Can-I-Lock-In-My-Number-

"Lock In Number will allow you to keep your number no matter how much you use it. You will not lose your number due to inactivity and it supports receiving verification codes. “