Phone Grading Scale: A, B, C, D Explained for Trade Buyers

Phone grading is the single most contested variable in wholesale mobile trade. Two suppliers quoting “Grade B” stock can be shipping units three quality tiers apart. This guide covers what each grade actually means, where definitions diverge, and how to lock down grading requirements before you commit to a purchase order.

The Standard A/B/C/D Grading System

There is no universal grading authority in the wholesale phone trade. What exists is a loose industry convention — with enough overlap that grades communicate roughly the same meaning across most UK, HK, and UAE-based suppliers. The framework below reflects the dominant market definition.

Grade	Common Label	Cosmetic Condition	Battery Health	IMEI/Network	Notes
A+	Like New / Open Box	No visible wear; no scratches on screen or body	Typically 90%+	Clean; unlocked or carrier-specified	Often unused or demo stock; original accessories sometimes included
A	Grade A	Light micro-scratches only; not visible at arm’s length	80–89% (most suppliers); some require 85%+	Clean; unlocked	Most common premium grade in bulk wholesale
B	Grade B	Visible scratches and/or scuffs; no cracks	70–79%	Clean	Functional for resale; common in refurb repair pipelines
C	Grade C	Heavy scratches, dents, possible bezel damage	60–70%	Clean or carrier-locked (specify)	Parts-quality or deep-refurb market
D	Damaged / Parts	Cracked screen, bent frame, missing components, or non-functional	Any	May be blacklisted; verify before buying	Parts-only; should never enter retail channel as-is

Some suppliers insert an A- grade between A+ and A, or a B+ between A and B. When a supplier uses non-standard labels, ask for the explicit battery floor and cosmetic tolerance for each grade before quoting.

Battery Health Requirements by Grade

Battery health is the most commonly misrepresented spec in wholesale lots. Standard market expectations:

• Grade A+: 90% or above. Units under 90% should not be classified A+ regardless of cosmetic condition.
• Grade A: 80% minimum is the market norm. Some buyers — particularly those supplying EU markets — specify 85% as their floor for A-grade stock.
• Grade B: 70–79%. Functional but degraded; refurbishers typically replace batteries at this level before resale.
• Grade C: 60–70%. Battery replacement is assumed cost of sale.
• Grade D: No meaningful floor; unit may not power on.

Always request the battery health distribution within a lot, not just the grade label. A 1,000-unit “Grade A” lot can contain 150 units sitting at exactly 80% — technically within spec, but worth pushing back on.

Why the Same Grade Means Different Things From Different Suppliers

Grading is self-certified by the seller. There is no third-party audit at point of grading unless you commission one. In practice:

• HK and Shenzhen traders tend to grade cosmetically but are inconsistent on battery thresholds. A “Grade A” from a Shenzhen bulk trader may include units at 78% battery.
• UK refurbishers (particularly GDPR-compliant data-erasure operations) typically grade more conservatively because they are selling into a retail-adjacent channel with returns exposure.
• UAE re-exporters often handle stock from multiple upstream sources with mixed grading histories; grade consistency within a lot is lower.
• GSM Exchange and MobileSources sellers range widely — grade definition is set by each exhibitor/lister, not the platform.

The only way to verify is inspection — either pre-shipment inspection (PSI) by a third party in the source country or bulk testing on arrival. For orders above roughly 200 units, PSI cost is typically recovered by catching a grade dispute before funds clear.

What “Fully Tested” Means

“Fully tested” has no fixed definition either. What it should mean — and what you should specify in writing — is a pass/fail check across:

• Display (touch, pixel, brightness)
• Front and rear cameras
• Speaker, earpiece, microphone
• All physical buttons and switches
• Charging port (data and power)
• Wi-Fi, Bluetooth, cellular modem
• Face ID / Touch ID / fingerprint sensor (if applicable)
• Battery health reading (from the OS, not estimated)
• IMEI check against known blacklists (Swappa, CTIA, national carrier databases)

Suppliers who run automated bulk test lines (common in HK and Shenzhen refurb operations) typically produce a test report per IMEI. Request a sample test report before placing a large order; a supplier who cannot produce one is not fully testing.

IMEI and ESN Status by Grade

IMEI/ESN status is separate from cosmetic grade and must be specified independently.

• Clean/Unlocked: No blacklist flag; no carrier lock. This is the baseline for any stock entering a resale channel.
• Carrier Locked: Bound to a specific network. Acceptable for some markets (UK networks, US carriers) where unlocking is legal and straightforward; problematic for export.
• Blacklisted/Blocked: Reported lost, stolen, or unpaid finance. These units should never enter any resale channel. Grade D lots from unknown sources carry material blacklist risk — always run batch IMEI checks.
• Finance Encumbered: Common in UK and US stock. Units may not be technically blacklisted yet but have outstanding finance agreements. Screen with GSMA Device Registry or carrier-specific tools.

Grade A and B stock should default to clean/unlocked unless explicitly stated otherwise. Never assume.

Glass Replacements and Grade Impact

A unit with a replaced screen — OEM or aftermarket — affects grade classification in practice even when suppliers do not flag it:

• A replaced OEM screen in perfect cosmetic condition may still grade A, but must be disclosed for buyers reselling into markets where original-part provenance matters (EU refurb regulations, Apple-certified channels).
• An aftermarket screen replacement typically drops a unit to B regardless of cosmetic appearance, because display quality and colour accuracy are degraded versus OEM.
• An undisclosed screen replacement discovered on arrival is grounds for a grade dispute. Specify in your RFQ that all screen replacements must be declared.

Battery replacements follow the same logic: a fresh OEM battery replacement is fine; an undisclosed third-party cell is not.

How to Specify Grading Requirements in an RFQ

Loose RFQs produce loose lots. A tight grading spec in your request for quote should include:

1. Cosmetic standard with explicit tolerance (e.g. “Grade A: no cracks, scratches not visible at 30cm, no dents”)
2. Battery health floor (e.g. “minimum 85% all units, no exceptions”)
3. IMEI status (e.g. “clean/unlocked only, batch IMEI report required pre-shipment”)
4. Disclosure requirements (e.g. “all screen or battery replacements to be flagged per unit on packing list”)
5. Testing standard (e.g. “fully tested per [list above], test report available on request”)
6. Rejection tolerance (e.g. “lots with more than 3% cosmetically mis-graded units will be disputed”)

Specifying this in writing — in the PO or via email before funds move — is your primary protection against grade disputes.

Price Steps Between Grades

Price differentials between grades vary by model and market conditions, but the following rough relationships hold across most bulk iPhone and Samsung trading in HK/UK/UAE corridors:

Grade Step	Typical Price Reduction
A+ to A	5–12%
A to B	15–25%
B to C	25–40%
C to D	50–70% (relative to A)

Grade B and C stock becomes increasingly attractive when repair costs are factored in — a B unit needing only a battery replacement can be refurbished to A-equivalent at lower total cost than buying A stock outright, depending on volume and battery cost. This is the core economics of the bulk refurb pipeline.

The spread between grades widens in a soft market (excess supply) and compresses when stock is tight. Track the spread, not just the absolute A-grade price, to identify where value is sitting in the current market.