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goldworldnet

Gottfried

To: goldworldnet who wrote (93232)	3/26/2016 4:32:03 PM
From: Eric L	2 Recommendations Read Replies (1) of 110582

CDMA vs. GSM: What's the Difference? ... The difference is that 'GSM' is an evolved and evolving all digital end to end mobile wireless network, and 'CDMA' is a digital legacy mobile wireless air interface that started life analog (IS-95/95A cdmaOne). With all due respect to Sascha Segan who is a reasonably knowledgeable tech writer, digital mobile wireless is not his bag and his PCMag article is somewhat misleading. CDMA and its 3GSM WCDMA variant is and air interface and The Global System for Mobile Communications (GSM) is not characterized by it's air interface. Unlike IS-95 cdamaOne which was and analog technology on ANSI-41 networks, GSM was always a digital system which originally in the 2G and 2.5G era utilized a tdma based air interface on a GSM MAP network. In the 3G era 3GSM utilized a WCDMA air interface standardized in 3GPP while CDMA2000 continued to employ CDMA based air interfaces (1xRTT and 1xEV-DO). There are no '4G' networks employing CDMA air interfaces for data transmission although a few use CDMA transmission for voice. Ersatz 4G (LTE) and real IEEE sanctioned 4G LTE Advanced) mobile wireless networks all use OFDM/OFDMA based technologies (LTE and/or LTE Advanced) standardized in 3GPP for the air interface. The original major US 'CDMA" network operators (NOs) were BAM and NYNEX which merged to become BAM/NYEX Mobile which with the adition of some other CDMA based network opertors became Verizon Wireless, and Sprint PCS. Both today are GSM networks although Sprint uses primarily CDMA for Voice transmission. Verizon Wireless started rolling out voice over LTE (VoLTE) and stopped selling mobile phones with a CDMA air interface component in 2014. Late in 2014 Verizon began to refarm its PCS 1900 MHz networks to LTE Advanced with VoLTE. Verizon Sunset on Verizon Wireless support for CDMA will occur by 2021. All this makes it difficult to find a really suitable US alternative NO or MVNO for someone with an unlocked Verizon Wireless mobile phone (and Sprint or Sprint reseller is not a real alternative) and likewise a suitable alternative to switch from Sprint to another NO (but they can switch to a Sprint MVNO reseller). [I use a Samsung Galaxy Android CDMA/LTE smartphone and subscribe a postpaid $23/mo plan with unlimited inbound/outbound domestic voice calling and SMS/EMS texts. All my mobile data usage on it is over WiFi. The smartphone phone is carrier unlocked but can't be used on a Verizon network or T-Mo USA network. All personal computing is done with a keyboard and mouse on a desktop or a Kindle Fire HD with Bluetooth keyboard over WiFi. ] Cheers, - Eric L. -

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