Internet on BlackBerry Curve 8520

[#1]

Hi guys.I just bought a used BackBerry Curve 8520. I'm totally dumb when it comes to technology but  I thing its unlocked. The seller sayed it works with any network and I can send texts and get calls with giffgaff but nternet does not work. I sended text woth SETTINGS on 2020  and received such answer - "We are having trouble dealing with your request. Http:??giff.ly?gg_blackberry has info about setting up your phone with mobile internet and picture messaging.?
I looked it at giffgaff website it says - "Can I use a BlackBerry on giffgaff without buying the add-on? Yes, but you will only be able to use your BlackBerry for standard calls and texts and Internet, you will not be able to use any of the BIS services without the Add-on. " - so as I understand I should be able to use basic internet? I tried to set up my browser but it shows only o2,vodafone,orange,t-mobile networks,no giffgaff. Now its set up to o2 network. Since  theres no giff gaff option i cant chose it,but for texts or calls it shows giffgaff network.
So how in the world I can get internet on my phone?
Thanks for your help and sorry if my spelling is incorrect-english is not my birth language.

[#2]

http://community.giffgaff.com/t5/Learn-giffgaff-Top-Tips/How-to-giffgaff-a-Blackberry/ta-p/3520913

Refer to this BB guide

[#3]

To use the internet without the addon follow this guide http://j.mp/bboperamini

[#4]

Manual Settings:

GPRS-3G Settings

Connection Name: giffgaff - GPRS
APN - Access Point Name: giffgaff.com
Proxy Server Address: 193.113.200.195
Proxy Port:8080
Login - Username: giffgaff
Password: password
MCC: 234
MNC: 10

[#5]

follow this settings

http://community.giffgaff.com/t5/Learn-giffgaff-Top-Tips/How-to-giffgaff-a-Blackberry/ta-p/3520913

[#6]

Have a look at these:

How to Giffgaff a Blackberry - http://bit.ly/giffgaffblackberry

Wasnt sure if you said you have the addon:

Internet without the BlackBerry Add-on
In order to get the internet working on a BlackBerry without the BlackBerry Add-on you will need to have the Opera Mini browser installed on your BlackBerry instead. Follow this simple guide on some instructions to getting on the internet with out the BlackBerry Add-on:

First of all set up your BlackBerry internet settings to the following:
APN: giffgaff.com
Username: giffgaff
Password: password

Then, while connected to wifi, you need to download the Opera Mini internet browser from the BlackBerry App World

Now when you want to use the internet use the newly installed browser, Opera Mini, and it should work!

Click here for BlackBerry related links!

Click to reveal

Blackberry

How to Giffgaff a Blackberry - http://bit.ly/giffgaffblackberry

Blackberry app world & Blackberry Browser - http://bit.ly/ecXpIK

BBM and BB Alternatives - http://bit.ly/ekN2eN

Facebook & Blackberry - http://bit.ly/igz4hl

*Why can't I browse the Internet? - http://bit.ly/i7dGhk

Blackberry smartphone Apps list - http://bit.ly/ggblackberryapps

Blackberry messenger alternatives - http://bit.ly/bbmaltgg

Advanced Blackberry usage - http://bit.ly/bbusagegg

Blackberry Config Tip - http://bit.ly/ggconfigbbtip

[#7]

How to Giffgaff a Blackberry
• http://bit.ly/giffgaffblackberry

Blackberry Guide with BB Addon 
• http://j.mp/ggbbbrowser

Blackberry Guide Without AddOn 
http://sites.google.com/site/blackberrysettings/

[#8]

see the guide at http://bit.ly/giffgaffblackberry which explains the giffgaff blackberry service.

[#9]

BLACKBERRY - http://bit.ly/jitbblackberry

without add on: https://sites.google.com/site/blackberrysettings/

[#10]

Reboot the device?