#3g antenne Bluetooth#

This can mean that even if unlocked, a phone on the 'wrong' network is only able to make voice calls and used low-rate data, without access to the high-rate data service of the 'foreign' network. Often, phones sold through a carrier will only support the bands actually used by that carrier. A good discussion of how voice and data share the network (when both are available) is available in the following article on Using data versus voice in an emergencyĪctually, most phones support several different frequency bands which they may use for different carriers or different parts of a given carrier's network or different services from that carrier.Īn obvious demonstration of this is that the two main US GSM carriers - AT&T and Tmobile have tended to use different frequency bands for their highest speed data offerings. This means that in 4G, traditional voice calls are replaced by IP telephony.Īnother thing to note, is that while voice requires less bandwidth, it requires a continuous connection. In 4G systems, the circuit-switched infrastructure is abandoned and only a packet-switched network is provided, while 2.5G and 3G systems require both packet-switched and circuit-switched network nodes, i.e. Since the 2.5G GPRS system, cellular systems have provided dual infrastructures: packet switched nodes for data services, and circuit switched nodes for voice calls. Such as:ĮV-DO is not designed for voice, and requires a fallback to 1xRTT when a voice call is placed or received. There are some interesting notes in the Wikipedia article on 4G if you search for the word 'voice'. So when a 3G or 4G signal weakens in a particular area, there is usually a 2G signal to fall back onto but it will only provide voice and text. 4G provides data only and voice is either done by falling back to a different communications model (frequency/'G') or via voice over IP. 3G provides voice (GSM only, see below) and data on the same frequency, and, in some model phones, at the same time.

#3g antenne Bluetooth#

Bluetooth and WiFi operate very differently and require different antennas as can be seen in the teardown.ĢG connections provide voice and text and, since it's the oldest, has the widest coverage. Since the 'Gs' are similar in the way they operate, they can use the same antenna. What you are doing when you disable your data, is shutting off the modem in the chip that talks on a particular frequency. This also handles your 2G connections as well even though they all operate on different frequencies: In the last photo, you can see that the LTE and EVDO antenna is one and the same. For instance, here is a teardown of my phone: You can see this in a teardown of whatever phone you have.

Your connection to the cellular network, no matter the 'G', always uses the same antenna.