Can't use apps outside of my house?

Ever since i changed my Sim card on my IPhone 4S I have had a problem.

Basically, whenever I'm without a WI-FI connection, I can't use any of my Apps that require an internet connection such as Facebook, Twitter, WhatsApp etc…
I have checked and my 3G ( Cellular data ) is enabled.
I have no idea what to do. Any help would be appreciated!

Hi
I suggest you should try to take out the sim card and insert it again. Perhaps that will work.

Some small time wireless carriers have 2 kinds of data plans… To suck more money out of the customer… They are 1) Mobile Data and 2) Web Browsing… 90% of modern big companies take the 2 and just call it 1 plan----a data plan, 1 price, 1 version, no split… Like USA based wireless carriers… I can't vouch for international carriers in other countries.

If you have #2, then no apps will work… Only your internet web browser will work

If you have #1, then apps will work,… But never your internet web browser

if you know for fact that your plan has BOTH #1 and #2, then call yoru carrier and tell them you have no data

Did you switch out the SIM card or did the carrier do that? Or did you just stick another one in? If you did it yourself most likely there's a discrepancy. This is the best resolved by going to a physical location of your carrier.