Simply if you go on dialaphone's website you will see that a package may consist of 250mb Wi-Fi and 500mb data.
Sure I know what you're referring to now. Some carriers include a WiFi allowance as part of their plans, which can be used at certain places where you might normally have to pay to use a WiFi service, e.g. shopping malls, airports, subway stations, railway stations.
This is in addition to their normal 3G/4G data plans.
What happens with these paid WiFi services when you connect, there is a landing page and you should be able to select your carrier from a list, then should be able to enter your phone number or username and the password.
AFAICT Dialaphone is only a retailer and not a carrier, so presumably this is a service offered by Vodafone, Orange, T-Mobile, O2, etc.
If I turn off my packet data does that mean I will never ever be charged for using the internet? Obviously I will only be using Wi-Fi.
Who or how can someone charge me for using Wi-Fi?
Anywhere can charge you for using a WiFi service just by having a landing page when you connect, and then expecting you to give payment details or logging-in with a pre-paid account. Then you'll get internet access.
Seems that my network cant. But then why would they offer say 250mb Wi-Fi free in the package deal???
It is something a carrier might offer as part of your package. I know my carrier, China Mobile, does it in some of their plans, I can use WiFi services in certain places where I would normally have to pay for it. What happens here is when I connect, I enter my phone number, they send me an SMS with a code, I enter the code and that gives me an hour. If I want any more, then it's debited from my pre-paid account. But it's cheaper and faster than using 3G.