There is an issue with firmware (LPQ) specifically for Samsung Galaxy S2 running ICS 4.0.3 where SMS is sent twice on all 3rd party apps (including Handcent, GO SMS, etc) except stock messaging app. I think the latest version of firmware LP7 fixes the duplicate send SMS issue.
However, Handcent & GO SMS has found their own workarounds and upgraded their apks to market.
Does anyone else know how to fix this issue programmatically using sendMultipartTextMessage() or/and sendTextMessage()?
thanks!
Check out the workaround at the official bug report http://code.google.com/p/android/issues/detail?id=27024#c23
And the Android Library project that wraps the workaround in a nice consistent API: https://github.com/nadam/compatibility-sms-manager
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