[One (M7) Android Development] dimushor:
I will definitely go to the carrier and try to research the issue, regarding the HTC one from the carrier, my carrier does not sell HTC One at all, and even of they would sell, they sell it unlocked.

I friend of mine, who is on other carrier, replaced the sim with an LTE sim andd when i checke the chip, it was exactly the same, whereas when i checked my sim, the chip was different than the usual sim. and i read on internet (now google translation from a Russian site, sorry, was too lasy to translate on my own all of this, but the idea is clear):

I'll try I shall place all the i about the HTC One of the network LTE 4G ( with respect to the operator MegaFon Moscow) .

What you need to work in LTE HTC One MegaFon ?

You must meet the following four conditions :

1. Actually , to have on hand HTC One.

2 . Use MicroSim card 4G (USIM).

3 . Connect one of the tariff options : for example , the Internet or the Internet XL XXL. Connecting this tariff option for SIM 4G UMTS, connects the technological option , which allows registration and further work on the network 4G. (It is important to connect it to the ICC 4G (USIM), not the MSISDN or personal account , ie after changing SIM, should reconnect TO)

4 . Be in the range of a network LTE 4G.

When all these conditions will be available to network 4G. If at least one of the conditions is not met, then the network will only be available 3G/2G.

How to make the transition from network to network (CSFB), what services are provided ?

1. Since the service is voice for LTE networks VoLTE still not available to us , the 4G network services are available only transmit / receive data, and SMS-Services (incoming and outgoing ) .

2 . Voice services (including video calls ), USSD and MMS-message to the LTE network is not available.

3 . If the caller is registered in the LTE network and begins to use the services of voice , send / receive SMS- and MMS-message , dial USSD-command , it will automatically change to the LTE network for 2G/3G. After the completion of the use of these communication services HTC One again automatically registered in the network LTE 4G.

How is the transition from one network to another?

Going for an outgoing call , in my personal observation : takes 4-5 seconds , when an incoming bit longer , 6-7 seconds .

According to the megaphone : Automatic registration of SIM- card of a 4G network in 3G runs for 20-30 seconds

Glossary :

CSFB (Circuit Switched FallBack) - can be described as a temporary crutch, which will allow phones to transmit data on the network 4G, and voice over 2G/3G. The device in standby mode or data is on the network LTE 4G, on the time of the incoming or outgoing call goes to the network 3G/2G, after ending the call is returned to the 4G network

VoLTE (Voice over LTE) - Voice over IP-based networks without the participation of previous generations of cellular networks . Is not introduced because of problems with customer equipment ( no support ), and problems , call them administrative ...

ICC - (Integrated Circuit Card) - Ingots SIM card , which is assigned a unique number / code of the SIM card (ICCID), he painted in detail in the standard ITU-T E.118. This unique number contains information about the manufacturer, and of the operator , the serial number , checksums , etc.

MSISDN (Mobile Subscriber Integrated Services Digital Number) - Electoral phone number ( simply , what we call a telephone number ) , check the contract associated with the SIM card The bar carrier billing .

USIM, Universal SIM (Universal Subscriber Identity Module) - This is an enhanced version of the SIM-card has more memory, and operates on 2G and 3G ( voice and data) and in the network 4G ( only data) , has a high degree of safety.