Tesco sim doesn't work in unlocked iPhone 3GS?

I have just bought a second hand unlocked iPhone 3GS off of eBay. The phone works fine but when i put in my contract tesco sim, it doesn't work and just says no service. What can I do?

Bloody useless tesco

Did you get a text from them with your settings? The only other thing I can think of is that perhaps Tesco do not support this model of iphone, they sell the 4 and above and only today my husband bought an unlocked 4s and has his Tesco contract sim in it working fine.

Sometimes a network does not support the phone, you should call Tesco mobile tomorrow and ask them if they do support this model and if so they will help resolve the issue.

Its not unlocked

Contact the seller and return for a refund.
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