Iphone 4s sim swap for straight talk?

I had gotten my iphone 4s about a month ago and a friend of mine unlocked it for me. I have been trying to do a sim swap with my iphone 4s but its not letting me go into cellular data for some reason. I take my straight talk sim card out and put in the t-mobile one(unactivated). I go to settings, general, and cellular and than i take the t-mobile sim card put in the straight talk sim card but it doesn't stay on that page. It goes right back to the general page. I restored my phone twice now and i still can't get it to work. Please someone help me out.

Make sure your phone is really unlock.

Step 1: Find out your IMEI number by going to Settings > General > About.

Step 2: Go to IMEI.info and enter your IMEI in the box. Click "check".

Step 3: The website will load information about your iPhone. At the bottom right of the page, click on "Free simlock status check", as showed below.

Step 4: The website will check your IMEI against the database of factory unlocked iPhones and will let you know whether your iPhone is officially unlocked or not.

If it is already unlock and the straight talk sim card still doesn't work, call the straight talk hotline to help you activate the simcard.

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