I need a mobile internet package.Can anyone advise which package and operator is the best to use?

That really depends how much bandwidth you'll be using. What are you going to use internet for on your mobile? Video streaming, email, surfing? How often will you need to be connected?

I have an iPhone and there's a setting which shows you the data usage. It is very handy and you can use it to guess how much bandwidth you'll need in a month. First reset the data usage and use WiFi at home (so that you don't pay for mobile internet just yet) to calculate how much bandwidth you'll need monthly. If you don't have this functionality on your phone, then it might be worth downloading an app similar to that. Otherwise, there's a website which can help you estimate your bandwidth needs, just google it.

Once that is done, then we can better help you choose a package and operator.