The proxy market runs on resale: there are usually two or three middlemen between the provider and you. Not everyone lies, but everyone should be checked — and checked immediately, while the refund window is open.
1. Residential that is really datacentre
The most common swap. Sold as a home address, listed in the databases under a hosting company. One minute with any ASN lookup settles it: if the owner is a datacentre, you were sold something else.
2. Private that is really shared
You cannot verify this directly, but the symptoms are clear: the address is already on blocklists, captchas appear out of nowhere, some sites refuse to open at all. All of it is residue from the previous tenant.
3. Country from the price list, not the database
The seller writes «Germany», the geo databases say the Netherlands. What matters is not the label in the dashboard but what Telegram itself sees. Check several sources: they disagree, and two out of three is your answer.
4. Dead addresses in the batch
Two out of ten do not respond, on the assumption that you will test the first three and stop. Test all of them at once — see testing a proxy.
5. Rotation dressed as static
The address changes once a day, and there is a line about it in small print. Watch it: record the external address in the morning and again in the evening. Why this is bad for accounts is in rotating IPs.
What makes these checks cheap
All of them happen before a live account sits on the address. Afterwards it is not a check but an investigation: the account is gone, and nobody knows whether the proxy did it or something else.
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