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USSD Phase 1, as specified in GSM 02.90, only supports mobile-initiated ("pull") operations. [8] In the core network, the message is delivered over MAP, USSD Phase 2, as specified in GSM 03.90. [9] After entering a USSD code on a GSM handset, the reply from the GSM operator is displayed within a few seconds.
Many network operators provide these subsidies as an incentive for users to sign extended contracts, and use the subsidy lock as a means of protecting their investment. The installation of such locks means that users often are forced to purchase a different phone if they decide to switch their network (of advantage to both the OEM manufacturer ...
If the wrong PIN is entered more than three times, the SIM card will become locked. It can be unlocked by entering the PUK code provided by the mobile service provider, [1] which may be available on the SIM card's packaging, the contract, or provided by customer service after identity verification. After the PUK code is entered, the PIN must be ...
If you are shopping in a physical store, open the Wallet app, select the card you’d like to use and hold your unlocked phone over the Tap to Pay card reader. The app will let you know once the ...
Usually the unlock process is permanent. The code required to remove all locks from a phone is referred to as the master code, network code key, or multilock code. If the phone is network locked it will typically display one of the following messages: SIM network PIN blocked, Enter lock PIN.
From the message list, swipe to the left on a message to delete. Tap on a message to open it and tap the trash can in the lower left. Delete multiple messages simultaneously. Tap the icon to the left of the sender's name on each message to delete. This will show the selection circles for all of the list. Tap the trash icon in the lower left.
ETSI and 3rd Generation Partnership Project (3GPP) standards, such as GSM and LTE, define supplementary service codes that make it possible to query and set certain service parameters (e.g., call forwarding) directly from mobile devices.
Many countries have acknowledged the use of the IMEI in reducing the effect of mobile phone thefts. For example, in the United Kingdom, under the Mobile Telephones (Re-programming) Act, changing the IMEI of a phone, or possessing equipment that can change it, is considered an offence under some circumstances.