It depends on the strength of the signal, and is usually 5-20 seconds.
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To send an anonymous text message, a website is usually needed. The message typed onto the computer and sent to the given number is converted from a text message to an SMS, and is then recieved by the other cell phone. http://www.sendanonymoustext.com/
No, you can't send any text message with any phone off.
Yes... when you send a text message - if the other phone accepts the message - it sends a 'ping' back to you - to let you know it reached its destination. If someone has blocked your number, the 'ping' cannot happen - and the network will state 'message failed'.
While in the US or Canada, each domestic SMS text message you send or receive is billed at $0.20 per message. T-Mobile does allow you to block both incoming and outgoing messages if you don't want to incur messaging charges. Depending on the plan you currently have or are considering and the number of text messages you normally send and receive, T-Mobile's talk+text plans may be more cost effective in the long term.
For example when you send a text message your message gos up to satellite and then bounces off towards the recipient.