My country has banned facebook and twitter, which means i need use vpn 2 connect facebook.

Please add full support for UPnP 1.1 / DLNA for third-party applications - perhaps even DPWS for potential future devices. The phone as a media / device controller is growing in popularity (ex: Sonos controllers).

It would be great if we will get some support for intercepting incoming calls and smss

Social networking APIs, like Facebook, are constantly adding new features. Proving access to the authentication directly (even if it were temporary) would allow applications to use the most up-to-date social networking SDK to provide better features for their users.

A "GrantAccountAccessTask" could, for example, ask the user for temporary access (including what permissions are needed). If the user did not have an account configured for that provider, they could be given the chance to create one (or simply redirected to the social network providers website).

As of now, it's not possible to set the accept-encoding header : it would be so usefull to be able to set gzip compression to save bandwidth especially on 3G !

Extend the DeviceNetworkInformation with the MNC (Mobile Network Code) and MMC (Mobile Country Code) values. We have an application that needs this information, and we cannot get it from the current DeviceNetworkInformation.CellularMobileOperator property, because the operator name can change over time.

Currently it's not possoble to make connections behind proxy servers that require authentication.
This very much limits business type apps that can use resources or run apps while connected to a work network.

It's only currently possible via the web browser.

Add Ability to set referrer and other custom headers when using HttpWebRequest

For those of us wanting to provide free applications it would be nice if the WP7 supported self signed certs or the very least a widely known free SSL authority.

Add ServicePointManager.

Or at the very least add a free service to your accepted list of SSL authorities. Like cacert.org for instance.

Support for Wifi-Direct enables a lot of user experiences like fast device to device communication. It is supported on Windows 8 and I really hope this will be added soon to Windows Phone.

Many universities use 802.1x authorizations for their wifi networks. On WM6.5 a program called SecureW2 was used however there is no such program for Windows Phone 7. On and Android and other iOS devices there are methods to connect to 802.1x networks. Will there be any new implementation of this in any new updates for windows phone?

I am using a open source API called OpenStack Storage (http://openstack.org/projects/storage/) that requires passing empty headers to remove certain custom metadata entries. The library being used by WP (HttpWebRequest) doesn't allow passing empty headers. It is unacceptable simply because according to RFC 2616 Section 4.1 (Header Field Definitions), the message headers of an HTTP 1.1 message value is optional. This is limiting me to provide customers to fully use my app for stuff like removing entries on their objects. The error I receive is something like "The header xxxxx has an empty value".

When the phone is locked (i.e. usually in my pocket, give users the option to disable 3G and just use edge for notifications etc.) Once the phone is unlocked and being used, 3G re-enables in the background for web browsing etc unless a Wi-Fi network is active. I'm sure that this would take normal day to day battery life well over the 10 hours or so that most people need.

Give ability to create games that have access for xbox live achievements. It doesn't have to be full access. Still only partners can have a "Xbox live" mark on their game icon, but having a one place for achievements, leader boards and friends would be great (WP7 Live?)

Socket APIs and duplex WCF communication

I am very intersting in develop app in WCF that let me to receive notificaction from the server or other clients, but this is impossible for three main reasons:

1.- WiFi is disabled when the phone is locked.
2.- It's not possible to have an app in background that listens the communication channel.
3.- WCF don't let duplex communication.

Ability to Send SMS in code without showing SMS Composer screen

private/corporate WiFi authentication with a certificate is not supported at Mango.