1) Welcome to the Party!
2) As you are obviously new here, I have some suggestions to help us all help you:
When you post, please post your entire configuration including (but not limited to) your installation method (7.X.X?) and vicidial version with build (VERSION: 2.X-XXXx ... BUILD: #####-####).
This IS a requirement for posting along with reading the stickies (at the top of each forum) and the manager's manual (available on EFLO.net, both free and paid versions)
You should also post: Asterisk version, telephony hardware (model number is helpful here), cluster information if you have one, and whether any other software is installed in the box. If your installation method is "manual/from scratch" you must post your operating system with version (and the .iso version from which you installed your original operating system) plus a link to the installation instructions you used. If your installation is "Hosted" list the site name of the host.
If this is a "Cloud" or "Virtual" server, please note the technology involved along with the version of that techology (ie: VMware Server Version 2.0.2). If it is not, merely stating the Motherboard model # and CPU would be helpful.
Similar to This:
Vicibox X.X from .iso | Vicidial X.X.X-XXX Build XXXXXX-XXXX | Asterisk X.X.X | Single Server | No Digium/Sangoma Hardware | No Extra Software After Installation | Intel DG35EC | Core2Quad Q6600
3) Inbound calls (when set up according to the Vicidial Manager's Manual) will arrive at Inbound->Show DIDs (Choose the DID). Modify the "DID Route" dropdown to "EXTEN". Then modify "Extension" to the number you would need to dial from a phone in your system to get to your cell (including dial prefix and dial code as necessary). Leave the "Extension Context" as "default".
And just for fun: read the rest of the Vicidial Manager's Manual. Seriously consider getting the paid version (200+ extra pages of stuff you can do without waiting a couple days on the forum for a response, plus Hi-Res graphics, definitely worth the $$)
4) Happy Hunting.