How to get an iPhone 4s to connect to a signal router?

We have the old Vodafone signal router. I recently purchased the iPhone 4s and converted my SIM card from my blackberry to my iPhone. So it has the same number. The signal router has my number connected with it but I still have no signal when inside my house. Any ideas on what I could do?

Added (1). I'm not talking about Wi-Fi, I'm talking about the signal in which you use to send people texts.

You can go to settings and turn on Wi-Fi and try to connect again and you may have to type in the pass code

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