I have the Nextel BB 7520 with a boost sims card. I am currently under
the unlimited 50 plan. These are all the apps that I have (I don't
have the links, but u can google them to find them...that's how I did
it):
1. Opera mini 4.2 and 3.1. Downloaded 3.1 from the desktop and 4.1 via
OTA. How did I download OTA? We will get back to that later. LoL
Anyways, with both browsers I can go back and forth between 2 web
pages simultaneously.

2.Nimbuzz 1.1- this free instant messenger will integrate all of ure
IM's (Google talk, aim, yahoo, etc.) into 1. It disconnects a lot tho.

3. Webmessenger- This does the same az Nimbuzz, but it runs more fluently.

4. Gmail 2.0.6- Download this app so that u won't have to go to ure
browser to check ure messages. Az far az the text message issue: Go
to gmail on your pc and click on "settings". Click on the forwarding
and POP tab. Now in the "forward a copy of incoming mail to" box, put:
YOUR BOOST . Now all incoming mail will go
straight to your phone. So if your facebook, myspace, etc, is set up
with your gmail, your phone will now be notified when you get a
message, comment, etc. U can also send texts to phone carriers through
your gmail. Here are some sms gateways:

Alltel

Ameritech

ATT Wireless

Bellsouth

Boost

CellularOne

CellularOne MMS

Cingular

Edge Wireless

Sprint PCS

T-Mobile

Metro PCS

Nextel

O2

Orange

Qwest

Rogers Wireless

Telus Mobility

US Cellular

Verizon

Virgin Mobile

When the recipient replies, it will come straight back to ure gmail and phone.
It would be wise to copy these sms gateway into your notes on your BB.
That way u can just copy & paste when composing a message
Also, my gmail app has the ability to have 2 accounts open...so u can
use 1 gmail for business and 1 for personal.

5.Google Maps 2.3- The directions are great! I also downloaded this
OTA, but u can also google the alx file for destop manager download.

Now in order to enable your phone to download OTA (Over-The-Air...or
from your phone browser...just in case you were still lost), the
process is very simple. U must 1st google the BB 7520 service books.
Download them to your DESKTOP on your pc. Then u go on your phone to
Options>advanced options>applications. Delete your browser if u have
one. Ure phone will then have the option to restart. Select "yes".
After your phone iz done restarting, Open up ure Desktop Manager and
restore the Service Books on your phone.
After u restore, go to the application loader and select the "Browser"
and the "Javascript Package" and install. If u have done the procedure
right, u will now be able to download Pics, apps, & games directly
from your phone browser.

So all in all I have all of these apps and unlimited minutes for just
$50 a month. I couldn't ask for a better phone experience. Oh yea here
iz a tip: (HOLD)SHIFT+BACKBUTTON will allow u to use your scroll wheel
to cycle between different apps all at once! This is how I copy and
paste a number from my adress book to my gmail. Or how I cycle between
my two opera mini's without closing neither one. U can actually have
ALL the apps on your phone open at the same tyme. It will take some
getting used to...but you will get the hang of it.