USB key modem for 3 internet

I am a student who have had three internet while studying, and I am now leaving to go home and is interested in selling it again. It is half price of what I gave for it. If you contact me before the 19th of november you are able to take over my account at three mobile, so you don't have to buy a new arrangement in a three store. You can decide how many gb you want per month, three has different options (when i checked three offered the cheapest solutions)