Is there any restriction of networks on iPhone 7?

Is there any restriction of networks on iPhone 7?

Well, some iPhones work on specific networks depending on bands. Have a look at the following link as it most probably answers your question: https://www.apple.com/iphone/LTE/#mn_p

Thank You Very Much

Or do you mean carrier locks? In the USA if you have an ATT iPhone its locked to ATT usage unless you unlock it to work with other carriers. Carrier locks are also network locks.