Iphone 4 shows "No services " or "No Sim Card Insert"

Hi all,
I have this problem with my iphone 4 recently.
When my phone is not in use for more than an hour, it either shows no services or no sim card insert. I yet to experience dropcall yet but i have miss several calls because of this.
Everytime if i experience this, i would on airplane mode and off it to regain back the network.
Im using starhub, call starhub but they say its not their network problem, so it prolly my sim card or iphone problem. Anyone facing the same problem ??
Please help, thanks.

Get a new SIM card. If it fixes the issue than it was the problem, otherwise it could be a hardware issue. If switching SIMs doesn't work then try the standard troubleshooting methods restart, reset & then restore. See if any of that works...

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  • HT4623 The SIM card inserted in this iPhone does not appear to be supported. Only compatible SIM cards from a supported Carrier may be used to activate iPhone. Please insert the SIM card that came with your iPhone or visit a supported Carrier's store to r

    The SIM card inserted in this iPhone does not appear to be supported.
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