Multiple sim cards for one number?

Okay here is what I want to do, don't know if it's possible or not.

I like to work on cars alot and in the past my phones have paid the price of dropping, getting greasy, or just been beaten up from being in my pocket while working on my car and doing other things like at work.

I still have my old t-mobile samsung phone and I wanted to know if anyone know's if it's possible to have another sim card made so that it stays under the same phone number so that way if I know I'm going to be doing something that might damage my behold, I can just turn it off and grab my old phone and turn that one on without having to change the sim cards everytime I swith phones. I got a new sim card with my behold but never activated it I just took the one out of my old phone and put it in the behold.

Is this something that I would be able to accomplish by myself, or would I have to talk to a service rep and pay money for it, or is it even possible at all. I had thought about adding another line but really I wouldn't use it that much to be worth the $10 a month and it'd be nice to just have the same number for both phones.

you fone number is directly linked to the number on your sim card.  How they track who's doing what. 

Tmo tracks your sim id # and the fones IMEI #.  But the sim id # is most important. 

If you have a hookup at tmo you might be able to get 2 sims with one number. but not sure if you can even put it in the computer like that.

ya it is possible to have a new sim with an old number, my dad lost his phone once and after talking to customer service he was able to get the phone replaced and keep his old number even though he'd lost the sim, dont know if it costs money or not though prolly not

o well that idk probably not, although you could try forwarding i guess

no just have 2 different numbers but have phone a forward all calls to phone b, then when you want to get calls on phone a again just turn forwarding off

well yea, but then again you get extra charges and well thats not really special and has nothing to do with the topic 

i have before a tv666,, and u can put 2 sim cards,,,  but always u have to change is setting with number u want that work,,, is really bad,,,,, to the same time doesnt work