Status code 201 means that the message is delivered to the mobile phone, this status change is generated by the mobile network of the receiver of the message. Some mobile networks do not support status messages and this could be the reason that you do not receive the status updates for some messages. On some networks the status updates are not 100% reliable and you might not receive delivery confirmation for all messages.
I have noticed that, when sending SMSes, the status for each sent message changes from 200 Sent to 201 received after a while.
For some messages the status never changes, but remains 200.
What determines if we receive reception confirmations (status 201). Is it network or receivers handset (or something else?)
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