Why is my iPhone 5s searching with no SIM card inserted?

I brought the iphone from eBay. I'm with Vodafone got my number put on nano sim my phone worked fine for first 12 hours then (searching) came up in top left corner tried turning off and back on. After 3hours found signal but this problem keeps happing. Took back to Vodafone they have changed the sim but is still doing same thing. If I take the sim out then switch off and back on again it still says searching when it should say no sim? Witch makes me think it could be the phone? Please some one help thanks

It may be a weak signal in your area, or it may be that your iPhone is locked to another network.

You could try taking it back to Vodafone and or an Apple Store.

Ok so I I have fix this problem now it would not let me restore phone so I put into recovery mode then restored my phone now it is fine so far fingers crossed this issue does not come back hope this helps any one with same problem

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