I opened my phone today and found it had gone into "Offline Mode" by itself. All phone features are locked and it is continuously looking for a signal. Any idea how it went into this mode or, more importantly, how do I get out of "Offline Mode"? The user manual does not address this and I have found bupkiss on the website so far. I have allready powered down, removed the battery, replaced the battery and powered up, but to no avail. Thanks for any words of wisdom.