Phone Grading Explained: What A+ to C Actually Mean for Buyers

Grade A, A-, B, C: every wholesale used phone supplier uses some version of these labels, but the criteria behind them aren't standardized across the industry. Before you place your first order with any supplier, you need to know exactly what their grades mean in practice, not just the label.

There's no universal grading standard

Back Market, Swappie, Refurbed, and wholesale distributors each publish their own grading criteria. A Grade B unit from one supplier can be equivalent to a Grade A- from another. That's not a minor inconsistency. It's the single biggest source of disputes between wholesale buyers and sellers.

The fix isn't picking a "correct" standard, because there isn't one. It's confirming the actual criteria in writing before you order, and re-checking that criteria matches what arrives.

SmartChoice grade definitions

• A+ / A: no visible scratches under standard lighting, no dents, cracks, or chips, 85%+ battery capacity, 100% functionality with a full diagnostic pass.
• A-: 1–2 micro scratches visible only at an angle, minor marks, no dents, 82%+ battery capacity, 100% functionality with a full diagnostic pass.
• B / B+: light scratches visible in normal use, noticeable scuffs, no cracks, 78%+ battery capacity, 100% functionality with a full diagnostic pass.
• C / C+: multiple visible scratches, clear signs of use but no structural damage, 73%+ battery capacity, 100% functionality with no functional faults.

Cosmetic grade and functionality are independent. A Grade C unit looks worn but passes the exact same diagnostic checklist as a Grade A+ unit. Anything that fails the diagnostic isn't graded at all. It's separated into a parts/repair category and priced accordingly.

Why Grade A is scarce, and priced like it

Grade A+ and A units make up only 18 to 22% of typical trade-in supply, the smallest share of any grade band. A- accounts for 28 to 32%, and B/B+ is the largest band at 30 to 35%. The structural scarcity of top-grade stock shows up directly in price: the wholesale premium for Grade A over Grade B on an iPhone 13 128GB averaged €28 to €35 in Q1 2026.

This matters for sourcing strategy. If your target market doesn't actually need Grade A cosmetics (see our Poland sourcing guide for a market where B outperforms on margin), paying the A-grade premium is money spent on cosmetic headroom your customers won't notice.

How grading happens

Every unit goes through the same four-stage process before a grade is assigned:

1. Intake — IMEI recorded and cross-checked against blacklist databases, activation lock confirmed removed
2. Diagnostics — full hardware test: display, cameras, audio, connectivity, sensors, charging, battery health
3. Cosmetic grading — inspected under standardized 500-lux lighting at 30cm, assessed against the criteria above
4. Factory reset — full reset performed, Find My / Google FRP removed and verified

Units that pass diagnostics but fail cosmetic grading get a grade. Units that fail diagnostics don't, regardless of how clean they look.

FAQ

What's the difference between Grade A and Grade A-?

Grade A allows no visible scratches under standard lighting and requires 85%+ battery health. Grade A- allows 1 to 2 micro scratches visible only at an angle, with a slightly lower 82%+ battery threshold.

Does a lower cosmetic grade mean the phone works worse?

No. Every grade requires the same 100% functionality pass. Cosmetic grade and functionality are graded independently, and units that fail functionality aren't given a cosmetic grade at all.

Why is Grade A more expensive than Grade B for the same model?

Grade A and A+ units make up only 18 to 22% of typical trade-in supply, the smallest share of any grade. That scarcity adds €28 to €35 to the wholesale price of a Grade A iPhone 13 128GB over the equivalent Grade B unit.

Where can I see the full grading criteria with cosmetic reference tables?

Our complete grading guide covers the full cosmetic reference table by component, return-rate data by grade and country, and pricing benchmarks across iPhone and Samsung models.

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Download the full grading guide, register as a reseller at shop.smartchoice.ee/register, or view current stock at shop.smartchoice.ee/stock.