How difficult is it to make a SIMPLE cell phone (Voice &SMS) with the intention of selling it on retail markets?
Hi!Thank you for quick reply. I absolutely agree with you. so many cell phone companies, lot of complex designs to make it competent in current day mobile market.But, what If I want to make a fixed-cellphone? something like this,1. which is always connected to electricity(maybe with a 2hours battery charging) using normal cellphone charger kind of. 2. size does not matter(compared to current compact models) 3. No other features except redirecting mic input to modem and voice from modem to speaker, no lcd = no separate application processor, memory etc needed? In nutshell, putting arduino+gsmshield+speaker+battery(backup) in a custom designed case (like arduino case) and connect it to power using mobile charger.And, what the user have with him is "JUST a gsm network" and what he wants to do is "just hear and talk when others call him" using that box.And regarding regulatory approvals; doesnt these readymade modems from Telit,Seimens etc have those approvals covered already? at least those data sheets talk a lot of many approval covered?I ABSOLUTELY value and trust every point you mentioned. All I am trying is to get things clarified more.Thank you once againNaveen
Any alternate suggestions if i still would like to make such "strange" device?
Naveen,you just sound ignorant.If you have a great idea which need cell phone capabilities, the cheapest way to go about it for hand-crafted prototypes is to get old cell phones, rip out unneeded parts and interface with them. You'd by surprised how many elder devices went that way where you find inside the box somewhere a disassembles Nokia, Motorola or Siemens phones.Next cheapest for prototype series is to get a ready made mobile modules. The pricing for those things decrease a lot when you buy bulk and that's the way most products with cell-phone capabilites go about these days. From the pricing your product will never be able to be competitive with regular cell phones simply because of the economy of scales. However this works well for niche-products with added benefits where a premium on the communication part is acceptable.Designing and implementing your own cell phone: Forget it. You have no chance of either getting right either the GSM protocol nor the air interface nor the voice handling in a reasonable amount of time.Korman