I'm only guessing it is asking for you to mount the Sim card. If it's already, you might want to remove it and reinsert. For the best support you really should check in with the Stratosphere people. They own your phone and know exactly what you are looking at and how to fix it. Here is a link for to that area: Samsung Stratosphere - Android Forums
Welcome to Android Forums. I hope you get past the Sim screen and can use these forums to get the most enjoyment from your phone.
Hello and welcome aboard. You will want to check in with the kind folk over at the Samsung Stratosphere - Android Forums. Thanks for joining the forums.
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