I have iPhone 4S and now in India it's say that invalid sim

I have iPhone 4S and now in India it's say that invalid sim.what can I do??

If you have a free Yahoo account, access from a mail client is not supported, according to Yahoo. It may work sometimes, but not consistently. You need a paid account. A free account is accessible only through the webmail interface.
You might be able to get Mail working temporarily with a free account by logging in to the webmail interface and confirming your identity, if prompted to do so.

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