What LTE 4G frequencies please

hio77:

Always check bands, not frequencies. 700mhz for example can come under B28, B12,B13,B14,B17,B29,B67.

For Spark/Skiny, currently to support All bands, you are best off making sure your phone has:

B28(700mhz), B3 (1800mhz), B7 (2600mhz), B40 (2300mhz)

Purchasing models with other firmwares may not totally be comparable with CA etc to get the Full speed out of the network.

Band support is also no guarantee - as mentioned above there have historically been some devices with B28 support that do not support the entire 45MHz block used by the APT band meaning they will not work on all B28 networks. I don't have a list of such devices but somebody else may be able to provide that. Newer devices *should* not have this limitations unless they're using an older chipset, and I have seen portable 4G devices with this limitation.

The reasons for for this are technical (to quote Wikipedia)

Two duplexers issue[edit]

In the APT 700 FDD configuration, two overlapping duplexers are required to cover the entire band due to the limitations by current filter technologies. The existence of two duplexers in the APT band plan and the fact that European, Japanese (and perhaps some other future networks) will only work with one duplexer set, raise a question of whether user and network equipment manufacturers will incorporate both duplexers in their equipment or will create two parallel configurations – one with only one duplexer and another one with both of them. Presence of both configurations would lead to less significant economies of scale for each type of the equipment and to distortions in the economic valuation of different parts of the spectrum in the 700 MHz band. Although the dynamics of the market such as the ever-increasing complexity of chipsets, multi-band support by chip manufacturers demonstrate that the most likely outcome is the inclusion of both duplexers in all devices. Additionally, whereas channel bandwidths up to 15 MHz can be supported anywhere within the band, channel bandwidths of 20 MHz are limited to the upper and lower parts of the band and may not be employed in the mid-portion of the band where the filters overlap.

As of 2014, most equipment vendors have released two versions of their radio units: one dedicated to the lower band and another one dedicated to the upper band. A notable alternative is provided by Alcatel-Lucent - their RRH2x40-07APT-4R radio unit covers the entire band 28 (45 MHz) within a single radio unit thus negating the need of sourcing two different radio unit variants.

ajw

coffeebaron

ajw

l43a2

coffeebaron

Dkeeper

hio77

Apple TV

sbiddle

Two duplexers issue[edit]

Jase2985