Q: What is the smallest volume I can send pr month?
A: There is no such thing as smallest volume. Although, if you have commited to a minimum monthly bill to get a cheaper price, you will be billed for the minimum amount even if you haven't sent any messages.
If you want to send a few personal messages every day, you can try this service: http://www.talksms.com. It's available world-wide.
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