Three weeks ago I have bought a SIM800L module which had the helical antenna in the whole package. Mounted everything right triple checking always and also powering it from a Li-po battery (3.7 V 1200 mAh). Now, the module answers to my commands but it doesn't register into the network. For example if I write AT+CSQ it will return +CSQ: 0,0 as for it doen't pick up any signal. Tried it with two different sim cards, one from Vodafone and the other one from Digi. I have also driven it around my area to see if it picks up any signal outside but no luck.
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HungryMonkey
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Now I have observed something else it blinks a few times stops completely then again blinks fast – HungryMonkey Jul 13 '19 at 07:52
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Have you seen "Sim READY" in the terminal when module power on? Also if it has some power issues it would send "PWR Down" or something else in a terminal. – Masoud Rahimi Jul 13 '19 at 08:39
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@M.R. now I have switched to an u.fl to sma antenna and same thing is happening. 9 blinks stops and then restarts – HungryMonkey Jul 13 '19 at 11:31
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It says call ready, sms ready – HungryMonkey Jul 13 '19 at 11:31
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Well I see something @M.R. very strange AT+COPS now returns the phone operators but AT+CSQ is 0 – HungryMonkey Jul 13 '19 at 11:33
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And also still restarting – HungryMonkey Jul 13 '19 at 11:36
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AT+CBC returns this +CBC: 0,9,3478 – HungryMonkey Jul 13 '19 at 11:40