SMS reminder

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Update: thx @Steven Peters, I had forgotten a connection so it wasn't working as expected.

This is a non-premium flow (30 blocks) that will remind you every 30 minutes (can be changed in block 7) to answer any SMS messages.
It does not store or send any information. The only thing fetched is the number that wrote to you and saved in a variable until you answer them.
At the start it will fetch all unread SMS messages and include those in the list. In block 48 you can include numbers to be ignored. Just remember they must be with international dial code and therefore as a string. It listens for sent SMSs as well as incoming and outgoing calls to those numbers and will consider the message answered, and no longer remind you.
I'm working on a premium version with some more features, but it'll take some time and I won't be able to try it out if it really works, since I'm using the free version.
Suggestions or corrections welcome!