Good morning,
First and foremost I like to use the phrase from one of my favorite British classics 'Hitchhikers Guide to the Galaxy' and that phrase is simply "DON'T PANIC".
Lets approach this calmly and try to find possible answers. First off, setting all phone and cell phone issues aside have you gotten any other signs or impressions that there is anything paranormal going on?
Second, do you know anyone who is tech savvy who may like to play a practical joke on you, or perhaps may be wishing to rattle your cage? Honestly in this day and age of Voice over IP (VoIP) and readily available technology on the internet its not that difficult to fake a source phone number.
Third, on many occasions wireless phones in the home will ring, or even dial out to programmed numbers if the signal is low or battery is going bad.
And finally when you saw that your house called you, did you recognize it by the picture or did you actually see the phone number which was calling? I've had many strange things like that on my Sprint cell phone. Often its because I had call forwarded on on my home phone. Or if you have a VoiP provider (including many cable phones, or special automatic busy call forwarding) on your home phone, it can automatically forward a call. And that call can sometimes appear to be coming from the home phone. All things I've personally experienced myself.
For many things there are perfectly normal explanations, and absolutely no need to worry. Could it be paranormal? Yes, of course it could. But lets not jump to that conclusion until we have other supporting evidence.