Problems with unlocked iPhone 3g

[rijojunior]

Okay, so my iphone is unlocked (version 3.0) so i can use it in tmobile but it isnt working 100% right.
I know some people have their phones unlocked and have no problems whatsoever, but with my phone there are certain things i cant do:
- I can't get push notifications
- The apps from the app store crash instantly, unless I get them from **********

Is there any way I can fix these problems? Or at least the push notifications one?
I've tried jailbreaking it and unlocking it again so many times with no luck, I use blackra1n, no luck!

If it doesnt work, I might just switch to a tmobile blackberry or a blackberry storm, I just don't know if I'll get used to it.
Thanks for your help!

[battlecrushr]

For push add this source in cydia
cydia.iphoneil.net
then install YouTube fix or pushfix
reboot
and btw this forum doesn't support cracked apps

[rijojunior]

I tried it before and it didn't work, and I tried to find it again now after having unlocked my phone again but cydia.iphoneill.net must have gotten rid of it because I can't find it!