No service on iPhone 3GS

So I've bought an iPhone 3GS on eBay which has a few issues one of which is the battery (which I will replace), the other is the seller stated it shows no service when they tested it with an O2 network sim card. Is there any hardware issue that could cause this and what should I check as I'm opening up the phone anyway? ( will try resetting network settings and trying different SIM cards once I receive the phone)

Thanks in advance

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