I bought a new sim card for my boost mobile motorola i1, but when i put it in, it says "no sim card." what's up?

It's not compatible.

Mark Motorola Support

It won't as they networks aren't compatible.

Mark

Decoding Rmztamen screen Bosta network for
Motorola i1

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i have a motorola i1 boost mobile..... i need a special code to unlock network block

Motorola i1 User's Guide
http://www.motorola.com/staticfiles/Support/US-EN/Mobile%20Phones/i1/Documents/Static-Files/i1_Boost_UG-EN_NNTN8085A.pdf

You can buy your unlock code for the below mentioned website. The estimated delivery time of the unlock code will be 24 hours.

http://unlockgenie.com/How-to-Unlock-Motorola-Motorola%20i1

I can't watch you tube videos on my motorola i1

T-mobile uses GSM technology, whereas Boost Mobile's technology is IDEN. There is no way a T-mobile sim card will work inside a Boost Motorola i855 phone or any Boost phones for that matter and, of course, vice versa.

I called Boost support about the same issue and I was told that that particular phone and any other Ic series phone by motorola will not work with Boost Mobile. There was also a few other phones that will not work. Try calling thier support line and requesting the list of phones that won't work. Good luck.