Line2 is cost effective, I think about $10 per month and it serves the purpose of adding a second line to an existing phone. Review collected by and hosted on G2.com.
There are some downsides. Texting is glitchy and it only allows one photo (attachment) per text, Not great if, like me, you need to send multiple photos, you end up needing to send multiple texts. Review collected by and hosted on G2.com.
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