I'll be travelling next weekend to England for two weeks. What would be the best way to have access to the internet during the trip?
Do phone companies offer WiFi dongles for tourists?
Internet is everywhere in the UK. You can buy a wifi dongle with prepaid sim card in any mobile phone store on any network. The price is reasonable - about £15 for the dongle itself, which include 1 GB of data. Then you just pay for data packs (£7-10 per GB of data depending on the network).
Most hotels offer WiFi these days. Most small hotels include it into the price, larger ones charge for it. In addition, majority of coffee shops, cafes and even McDonalds offer free wifi for their customers.
The long story short - you won't have any troubles getting online.
FON is a global wifi network from Spain. The concept is simple, you share your wifi with other FON members and as a result you can use WIFI from other FON members world wide. For the UK this is specifically interesting, since FON teamed up with British Telecom. Every BT member has FON included. If you check the global coverage map, you will notice that because if this the UK is well served. (As is Belgium where Belgacom has a similar arrangement with FON. )
All you need to do to enjoy FON is to buy a FON router and connect it to your Internet router at home. It is a one time investment. I have been a FON member since 2007, when I bought my FON router. It is still working and I have enjoyed WIFI access world wide. For Android there is a FON app that automatically connects when a FON router is in close proximity.