Check iPhone lock Status with IMEI. If calling works fine, the device is unlocked. If SIM doesn’t work, the device is locked. IMEI.info used to provide free service to check the start and end of the contract so that you can understand whether it is locked or unlocked. However, the option “SIM Lock and Warranty” is. Both AT&T (previously Cingular) and T-Mobile built their networks off of GSM technology, which meant unlocked phones were easy to bring to both carriers without much work. This continued throughout the 2G and 3G data days, and when it came time to build 4G-based networks, both carriers eventually evolved to LTE, a continuation of the GSM standards.
Check If Device Is Unlocked
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