android send bulk sms, pop "com.android.phone" process stops unexpectedly

I sendTextMessage sent every five minutes to 20 people with a message, began to send three or four times is normal,
Later on the pop-up "com.cking.okis" is sending a lot of messages prompt box, then immediately pop "com.android.phone" process stops unexpectedly,
Is this how to solve it?
What better way to send bulk sms it?

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Reply:
What emerged is a real machine? You do not know where to send text messages that can be sent in a sub-thread. Or send in service in circulation.
Reply:
Real machine is transmitted, and where a service is transmitted. And is sent in a sub-thread, that is a handler in
Reply:
Is android considerations for security reasons, the number of text messages were sent to check
Reply:
Thank you for sharing