miui no phone app or contacts app

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I have a dinc with imui rom and if i dont clear the data befor install, it starts fine but I dont have a phone app or conact app. The reason I dont want to clear data before install is I want to keep apps and also keep my progress in games I play (mainly angry birds) Aren't the phone and contacts apps system apps? So why does it matter if clear data? How can I fix this so I can use this rom I really like it and want to use it, but its worthless without a phone. help! thank in advance!