I have not used my boost mobile i335 in over a year. the battery is charging but it says insert sim. The sim is in there why does it still say for me to insert the sim?

Any phone that runs off the IDEN network will ONLY work on the iden network. It's physically impossible to use it on any other service.

Iden is such a weak signal that's only like 800mhz. There's no way ever to use it on anything other...

Technically the I335 was only designed for professional use which is why it has push to talk and 'rugged' design.

Iden phone motorola driver package. They have usb charging drivers for it.

Their tricky though to instal so unless you have the time and patients. I'd stick to wall charging.

Seems like either your charger is not working properly or in most case, your battery is faulty.

Yes you can use it, but, you need a boost sim card.  Nextel phones work fine on Boost (same network) but you need a boost sim.  You can get them cheaply on ebay, often with the $5 dollar credit for under $10.00.  Otherwise go to a local phone store and get a boost starter kit.  They are made so you can start service with a boost or nextel phone.

if you want to use your phone on a service like t-mobile or cingular, it wont work, you can only unlock it for iden, like boost mobile, nextel.
you can unlock it your self by going here
http://multiplexelectronics.home.att.net/software.html

i dont get service at my home but my sister who also has a boost phone gets service. i have a i335 and she has a white phone she paid 29.99 for. i called boost and they told me that i have to try to see if it is the phone or sim card. how can i check to see if there is something set up wrong or if the transmitter needs to be changed?

To the best of my knowledge, this happens because Boost Mobile does not want you to be able to get ringtones from anywhere but through them. If someone sends you an MP3 file in a message, that file most certainly would be supported by your phone, because the Motorola i335 supports MP3 files. However, Boost Mobile can be greedy at times. The reason they tell you that the object is unsupported is because if they would let you download the object and allow you to save it to your phone, you would be able to use it as a ringtone like you want to. If you are given the capability to use files from the internet, friends' phones, etc. as ringtones, Boost Mobile loses money, because you get the ringtone, and Boost receives no compensation for it, making it unnecessary for you to buy anything of that nature from Boost.

it can not work at all, boost mobile uses IDEN which is different from GSM. even if you unlocked the phone it won't work , sorry

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.

if it says sim pin blocked you will need another sim card, go on ebay and get a 5.00 starter kit with IMEI for like 4.50