This is based on user Reports/feedback. I would be grateful if you could PM me any information regarding Modems, so that it could be added here and be beneficial to EVERYONE. Thanks 
Based on GPS Info - Lock Speed and Accuracy
Based on Call Quality - Incoming and Outgoing
Based on Network (H,3G,2G) Speed and Connectivity
Based on Effect on Battery Life
Based on Carrier/Network/Country/Region
Based on User Reports
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My Personal analysis : It seems that the the top rated modems are the ones released in built up areas/countries/regions, and i designed to use more battery to give the best results especially when it comes to GPS Lock & Accuracy, Network, Speeds & Coverage. This does make sense, so if your in a built up area and use a modem designed for a less built up area which requires less power your not going to achieve goods results on paper, but if you use a modem designed for a built up area in a area that requires less, then your results are going to be sky high BUT might be to high and in turn drains more battery power than needed. So yes Modem's are clever little things, you have to find the right balance for your area, network, coverage, GPS and so on.
JPP is considered the TOP modem preference (See points below) BUT its uses alot of power to get those results.
Another thing to consider is : enabling 2G only which reduces battery consumption. H and 3G require more power.
RECOMMENDED LINKS ::
GPS INFORMATION
BATTERY DRAIN THREAD
MODEM MULTIMETRE TESTS
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Modems can be downloaded from DOC ROM THREADS
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NOTE: Offical Aussie Froyo rom is DTJP5, and its modem is JP3. The official UK Froyo rom is BUJP8 and its modem is BUJP5.
UGJL2 Modem - COMPATIBLE COUNTRIES/REGIONS = Hungary(T-Mobile), European
- -Call quality is excellent signal strength is solid
-Battery life is very good (50/50)
-GPS Locks Quickly (Confirmed)
-Sound quality perfect-no issues on either side
-3G/HSPA dl:3065 up:1280 (Hungary, T-Mobile)
-Seems that the modem was designed for urban area (although not in the USA), so it performs excellent(Budapest)
-Similar to JPY modem
-Signal strengh is perfect too
-GPS locks in about 10 secs, 7-8 satellites locked and stable 5-10m accuracy
-GPS really slower then JPY (Unconfirmed)
-Slightly more battery drain than JPY a lot more on wifi
-Battery Drain ist excellent, but the connection is Bad (Reported from Switzerland)
-Thin Mobile Network, the Signal is very poor (Reported from Switzerland)
-GPS is equal to JPY (Reported from Netherlands)
-Battery drain is equal to JPY if not better (Reported from Netherlands)
-Wifi Connection could be better, but is not 'bad', especially 3g is performing well compared to other modems (Reported from Netherlands)
XXJPY Modem - COMPATIBLE COUNTRIES/REGIONS = United Kingdom(Virgin Mobile UK), European
- -JPY seems to perform the same as JPE, JP5 and JPP. Only slightly higher battery usage as of better wifi/phone signal
XXJPX Modem - COMPATIBLE COUNTRIES/REGIONS = European
- -Varible GPS Lock speed
-JPX seems to perform the same as JPE, JP5 and JPP. Only slightly higher battery usage as of better wifi/phone signal
XXJPU Modem - COMPATIBLE COUNTRIES/REGIONS = European, U.S.
- -Call quality might be loud or distorted (unconfirmed)
-GPS lock VERY quick.
-GPS accuracy for the most part is ok, sometimes looses track(?)
-Overall call quality is ok
-Volume definitely seemed a bit low (Unconfirmed).
-Signal seems pretty strong, HSPDA speeds on speedtest app was 1.7Mb/1.5Mb down/up.
- d: 5035 u:1336 (Hungary, T-Mobile)
ZSJPD Modem, 1st Release - COMPATIBLE COUNTRIES/REGIONS = Hong Kong, Switzerland(Orange), Brazil(Operator VIVO 724-10)
- -Uses less battery power compared to JPP
-Sometimes loses signal (Unconfirmed)
-Quick ans solid GPS, Static and While Moving
-GPS Considered better than JPE (Unconfirmed)
ZSJPE Modem, 2nd Release - COMPATIBLE COUNTRIES/REGIONS = Hong Kong
- -Idle drain (Average of 7 hrs, 0% - 1%) depending on apps, update interval etc.
-Good signal Everywhere
-GPS a lot better
-Call Quality is crystal clear
-Can be considered equal or better than JPP Modem (GPS Lock Speed)
-Speed equal to JPP
-Excellent Battery Life (Idle and Usage)
-H Speed can drain battery, but not as fast as JPP
-Stable connection
BVJP5 Modem - COMPATIBLE COUNTRIES/REGIONS = France(SRF Network), United Kingdom(Vodafone UK Network), (U.S. - AT&T), Vodafone Global
- -Idle drain (Average of 7 hrs, 1% - 2%) depending on apps, update interval etc.
-Might not be good for Australia (Vodafone), Slovenia (SiMobil)
-Telenor, Hungary Users may lose brand, signal, data
-Does not seems to drain battery and data connection seems to be stable
-Fast GPS Lock
-Good Call quality Incoming and Outgoing (Loud and Clear)
-Possible that JP5 should be the best for all users on Vodafone Network (Global)
-Excellent Battery Life (Idle & Usage)
-Able to receive and make calls when no bars are shown (at which point the signal bars jump to one or two)
JPP Modem - COMPATIBLE COUNTRIES/REGIONS = European, U.S., (Global)
- -3G does not work on Captivate (unconfirmed)
-Considered Best Universal Modem
-Excellent GPS Lock Speed
-Excellent GPS Accuracy
-Good Network Speeds on H,3G,2G
-Huge battery drain and data deconnection from time to time (Unconfirmed)
-Battery/Phone gets Warm/Hot (unconfirmed)
-High battery drain on Idle
-Overall Verdict 10/10, High performance Modem = High Battery Usage
JPC Modem - COMPATIBLE COUNTRIES/REGIONS =
- -Varible Signal Reception (Low / High)
-GPS Considered Varible
-Battery life is considered variable (Mainly Heavy Drain)
JK3 Modem - COMPATIBLE COUNTRIES/REGIONS = Canada - Bell
- -Bands - 2100/1900/850
-850 reception it's solid
-Drain is 4-5% in 6-7 hours at idle
-Compatible with rogers and bell
-Drain is better than JPP modem
-Reception seems good (sometimes crystal clear, sometimes with a bit of distortion.)
JK4 Modem - COMPATIBLE COUNTRIES/REGIONS = Canada - Bell
- -Bands - 2100/1900/850
-Better call quality than JK3 but still not 100% clear
-Battery is on par if not slightly higher consumption thank JK3
-Data feels about the same speed
JPH Modem - COMPATIBLE COUNTRIES/REGIONS = Bulgaria
JP6 Modem - COMPATIBLE COUNTRIES/REGIONS = India, Asia
- - DDJP6 3g/hspa speed was d:2390 u:703 (Hungary, T-Mobile)
JPA Modem - COMPATIBLE COUNTRIES/REGIONS = Philipines
JPM Modem - COMPATIBLE COUNTRIES/REGIONS = Scandinavia Region (North European)
JPK Modem - COMPATIBLE COUNTRIES/REGIONS =
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USER INFORMATION POSTS TO BE ADDED:
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-JPP modem seems to be ok with this setup, what suprised me that speedtest results are better now than with JPP ages ago, and the same what I got with JPU modem (doc rom evolution is faaast...)
Now I got 5908/1324 kbit/sec d/u, under JPA it was 2951/694 at the same circumstances (I would 'blame' the provider...i think they made some improvement on the 3g service. I don't think that modem- rom change can cause such an improvement)
There's no problem with sound quality, GPS locks not so fast than with JPU, but acceptable. Accuracy 10m, locks 7-8 sats, tts 10 sec. I think average results, but seems better as well, than under the JPA rom...basicly the speedmod kernel's gps improvement settings can be responsible.
I can confirm that the overall loudness is reduced in the JPU modem: now with JPP it's noticable
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In short .... Data connections not working properly....
They are set up correct .... But sometimes the phone doesnt use them .... It a bit random ...
Every few minutes the data does not work, but it recovers and continues the connection ....
This is with 2.2 modems on the 2.2.1 jpu.
Data on jpu works flawless
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Re Modem: I'm using ZSJPE since yesterday (in combination with k10h) and I can say that reception here in CH is good as well as keeping (data) connections. Cannot say anything about data speed as I don't care about that. Call quality is unchanged, I never had problems there, regardless which modem I used (tried JPP, JPD, JP5 and many others). Drain during standby seems to be higher than with JPP but I need to further monitor that.
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I've been using 3 different modems for the past 9 days and id thought id share the results with you..
My setup is docs jpo v9 with k10i kernel at 500hz. My carrier is Vodafone (india) and do not use 3g .
I used each modem for 3 days to eliminate chances of any error. The modems I used were jpp jpe and jp5.
Im also using superpower app to try and maintain uniformity throughout the tests. I also used juice plotter to monitor battery graphs.
Jpp : it according to me performed the best overall but not by too much. Calls were crisp and no sudden signal drops. Even in areas of low coverage (1-2bars) calls went through without a hitch. Although 2g speed seemed to slow down in those areas which is understandable.
Regarding battery use I found out that the idle drain time would range between 2-3 % per 8 hours which is decent enough. By idle I mean no 2g or wifi running. I also noticed quite significant drain when using 2g or wifi as compared to the other 2 modems. Roughly 5% more per half hour of data usage (be it wifi or 2g)
Eventually I managed to squeeze 25 hours out of the modem on an average which is very decent but a lot of credit should go to superpower which does an amazing job of conserving battery.
Jpe : in contrast to what you had mentioned in the modem post I found that the idle drainage was much more that jpp or jp5. I initially attributed it to some app but after 3 days of similar results I was sure it wasn't any app. It would drain roughly 6-7% for 8 hours of idle time. (Same constraints as above). However that being said it consumed much less than jpp when actually using the phone with 2g or wifi enabled. Weird indeed.
My signal reception was a tad lower than jpp but never missed or dropped any call. Call quality was as good as jpp.
Jp5: for me where this modem really shined was in the battery department. OUTSTANDING. I achieved close to 32 hrs per charge on an average. The idle drain time was at max ,1% for a period of 8 hours. Even during actual 2g or wifi usage the battery fell at slower level as compared to jpp and jpe.
Call quality was decent but I did get a couple of failed texts when I tried to send them in areas with low coverage. Calls went through without a hitch though.
Well that's about it. I could not test on road gps performance for all 3 as i didnt have the time but the locks for all 3 were about the same. Jpp having the edge.
I know many of these points have been mentioned before but I thought of letting you know anyway so you can get some confirmation.
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Subject to changes at any time.
Read Original @ ..... POSTING HERE!!!
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