The biggest problem with most of those "phones" (at least at LG for sure) is they don't have a proper designed RF. For something else than a tablet (and the mobile phone is not a tablet) the most important device is the ...antenna. Old Motorola GSM phones had a 1.8cm helical antenna and a SAR of about 6. The peak RF output was about 7W. You could speak with those phones buried at 2m underground (it was tested). All those 2.5GHz stuff are "loosing" the signal because of huge interference between the processor and the RF. Now you need at least four antennas (one for WIFI, other for Bluethooth, another for GSM 900 and another one for GSM 1800 or WCDMA of whatever else at 2100. Not talking about LTE where the bandwidth characteristics is important. There isn't yet a small footprint universal antenna for all the communication frequencies. So finally we pay for a good computer and for a bad communication device. On Sun, Mar 8, 2015 at 7:52 AM, embedded systems wrote= : > OK, I didn't find yet the right answer. :) > Vasile > > On Sun, Mar 8, 2015 at 2:21 AM, Xiaofan Chen wrote: > >> On Sun, Mar 8, 2015 at 2:16 AM, embedded systems >> wrote: >> > Going deeper with the question: what gives the difference between thos= e? >> > >> http://www.phonebunch.com/phone-filter/processor/quad-core-2_5-ghz/page/= 1/ >> > >> >> In reality most of the phones (Sony Z3 Tablet Compact is really a tablet >> and >> not a phone) list should be good one. However, they differ on brand >> recognition >> and Carrier availability (as well as subsidy) which is a big factor if >> you are >> on a subsidized post-paid plan. >> >> Many of the cheaper China brand phones listed are not really carried by >> many telcos. So they are out if you want to utilize the carrier subsidy. >> Then >> the price tend to be similar among the top phones of Samsung/Sony/HTC/LG= .. >> >> >> >> -- >> Xiaofan >> -- >> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist >> > > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .