hi i know wat you mean. i have mine to silent and i have the same phone as you, but i dont have the same prob as u. sometimes my phone acts weird and does different things like says no network available and doesnt let me call ppl then it might say cant text or something..it acts up all the time maybe it is just the phone. o and ur right when i turn it off then on again things work but then they eventually stop again...k good luck w/ ur phone. =)
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