Uim Phone
Overview
Product sourcing insights & recommendations
The term 'uim phone' refers to mobile devices that utilize a Removable User Identity Module (R-UIM) or UIM card. This technology was specifically developed to bring the convenience of SIM cards (found in GSM networks) to CDMA (cdmaOne/CDMA2000) handsets and networks Wikipedia.
Market Trends & Insights
* Legacy Technology Niche: UIM phones are now largely considered a legacy technology. The global shift toward 4G LTE and 5G (which use USIM/UICC) has relegated R-UIM to maintenance of existing CDMA infrastructure or specific industrial applications Alibaba.
* Regional Strongholds: China remains the most significant market for UIM technology, driven primarily by China Telecom's CDMA heritage. Other active regions include parts of India, Indonesia, and Japan (legacy NTT DOCOMO services) WikipediaAlibaba.
* Dual-Mode Evolution: Modern "UIM cards" found on the market are often multi-standard (supporting 2G/3G/4G/5G) or dual-mode cards that can work in both GSM and CDMA handsets, expanding their utility for M2M and GPS tracking applications Alibaba.
* Product Categories:
* M2M/IoT: Blank 128k UIM cards are popular for GPS tracking and machine-to-machine communication where CDMA reliability is valued Alibaba.
* Ruggedized Keypad Phones: Traditional CDMA phones with keypad entry and Android-based dual-SIM (GSM/CDMA) capabilities still exist for specific logistics or industrial sectors AlibabaAlibaba.
UIM vs. SIM Comparison
| Feature | UIM (CDMA) | SIM (GSM) |
|---|---|---|
| Authentication | Uses A-Key and Shared Secret Data (SSD) | Uses Ki keys and Triple DES |
| Storage Capacity | Higher (Typically 256–512 KB) | Lower (Typically 32–128 KB) |
| Compatibility | Often tied to specific CDMA carrier provisioning | Broad global compatibility across GSM carriers |
Uim Card Phone Cdma
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Sources & References
23 sources cited · Verified industry data & reports
Removable User Identity Module
Wikipedia
Removable User Identity Module is a card developed for cdmaOne/CDMA2000 ("CDMA") handsets that extends the GSM SIM card to CDMA phones and networks.
UIM Version 3
NTTドコモ
*1 UIM: An IC card on which such subscriber infor- mation as phone number is stored. It is inserted into a mobile terminal and used for the purpose of user.
UM/UIM: What Is Uninsured Motorist Coverage?
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Definition of R-UIM
PCMag
(Removable User Identity Module) A removable smart card that is used in CDMA cellphones. The R-UIM is a superset of the SIM card used in GSM phones, ...
Uninsured and Underinsured Motorist Coverage Explained
GEICO
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Uninsured Motorist Coverage (UM/UIM)
Allstate
Like liability insurance, uninsured (UM) and underinsured motorist (UIM) coverage breaks down into two coverage types: bodily injury and property damage.